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A1 noun #1,306 most common 14 min read

warning

Top 1,306

Practice it Examples Notes & Tips warning in 30 Seconds

Explanation warning in your Level:

At the A1 level, a 'warning' is a very simple concept. It is a sign or a word that tells you to be careful. Think of a big yellow sign on a wet floor that says 'Warning.' It tells you that you might fall down. You might also hear a teacher say 'This is your first warning' if you are talking too much in class. It means 'Stop doing that, or you will be in trouble.' At this level, you should know that a warning is something you see or hear that helps you stay safe. It is usually about things happening right now or very soon. You can find warnings on food, on the street, and in your school. It is a noun, so you say 'a warning' or 'the warning.' Common words used with it are 'sign' and 'light.'

At the A2 level, you begin to see 'warning' used in more sentences and with more verbs. You might 'give a warning' or 'get a warning.' You also learn about 'warning signs' in a more general way. For example, 'The dark clouds are a warning of rain.' This shows you understand that one thing can be a signal for another thing. You also start to see the word in technology, like a 'low battery warning' on your phone. At this level, you should be able to use the word to describe simple cause-and-effect situations. You also learn the phrase 'without warning,' which means something happened very fast and you were surprised. For example, 'The dog barked without warning.' This is a very useful phrase for telling simple stories.

At the B1 level, you use 'warning' in more formal and specific contexts. You understand the difference between a 'verbal warning' and a 'written warning,' especially in a workplace or school setting. You can also talk about 'weather warnings' like storm warnings or flood warnings. At this level, you should be comfortable using prepositions with the word, such as 'a warning about the traffic' or 'a warning of danger.' You also start to use adjectives to describe the warning, like a 'stern warning' or a 'clear warning.' You understand that a warning is a way to communicate risk. You might also use the word as an adjective more often, such as in 'warning system' or 'warning label.' You can explain why a warning is important and what might happen if someone ignores it.

At the B2 level, you understand the nuances of 'warning' in professional and academic English. You can discuss 'early warning systems' in the context of global issues like climate change or economic crises. You are familiar with more complex collocations like 'to heed a warning' (to listen and act) or 'to issue a dire warning' (a very serious warning). You also understand metaphorical uses, such as 'a warning shot across the bows,' which means a small action taken to show that you are serious about a conflict. At this level, you can use the word to analyze situations, such as 'The company's falling profits served as a warning to investors.' You can also distinguish between a warning and similar words like 'caution' or 'admonition' based on the level of formality and urgency.

At the C1 level, you use 'warning' with high precision and stylistic variety. You can integrate it into complex sentence structures, such as 'The catastrophic failure of the dam was preceded by numerous warnings that went largely unheeded by the local authorities.' You understand the legal and technical implications of 'warnings' in contracts and product liability. You are also aware of the psychological aspects of warnings, such as 'warning fatigue,' where people stop responding to alerts because they receive too many of them. You can use the word in sophisticated metaphors and idiomatic expressions with ease. Your vocabulary includes related terms like 'premonition,' 'portent,' and 'harbinger,' and you know exactly when to use 'warning' instead of these more literary alternatives to maintain the desired tone.

At the C2 level, your mastery of 'warning' is complete. You can use it to discuss abstract philosophical or existential threats, such as 'The existential warnings of 20th-century literature regarding the loss of individual privacy.' You understand the most subtle connotations and can use the word to create specific rhetorical effects. You are familiar with historical and cultural references to famous warnings, such as the Sibylline Books or Cassandra's ignored prophecies. You can write technical reports on 'warning signal theory' in biology or 'warning systems' in cybersecurity with absolute clarity. You can manipulate the word's position in a sentence to emphasize different aspects of the message, and you have a deep understanding of how 'warning' functions within the broader landscape of English semantics and pragmatics.

Practice it Examples Notes & Tips

warning in 30 Seconds

A warning is a signal or message that alerts you to potential danger, allowing you to take action to stay safe and avoid negative outcomes.
It can be verbal, visual, or auditory, ranging from a simple 'look out' to formal government alerts about weather or public safety emergencies.
In professional and legal settings, a warning is a formal notice that behavior must change to avoid disciplinary actions or serious legal consequences.
Commonly used with verbs like 'give,' 'issue,' and 'heed,' it is a countable noun essential for communicating risk and ensuring personal and collective security.

The word warning is a versatile noun that functions as a crucial communicative tool in human safety and social interaction. At its core, a warning is a piece of information given to someone so that they can avoid danger, trouble, or an unpleasant situation. It acts as a bridge between a potential future threat and the present moment, allowing for preparation or evasion. In everyday life, you encounter warnings in various forms: a mother telling her child not to touch a hot stove, a yellow sign on a wet floor, or a digital notification on a smartphone about an incoming thunderstorm. The essence of a warning is its predictive nature; it is not about what has already happened, but about what might happen if action is not taken. This word is foundational in English because it covers everything from a casual 'heads-up' between friends to a formal, legal document issued by a government agency.

The Nature of the Signal: A warning can be verbal, such as a shouted 'Look out!', or non-verbal, such as a siren or a flashing red light. It is intended to trigger a specific psychological response: heightened awareness and caution.

The lifeguard blew his whistle as a final warning to the swimmers who were going too far out into the deep water.

In professional contexts, specifically in meteorology, the word carries a very precise technical meaning. A 'warning' is distinct from a 'watch.' While a watch means that conditions are favorable for a hazard, a warning means that the hazard is actually occurring or is imminent in the specified area. For example, a tornado warning means a tornado has been sighted or indicated by radar, and people must take cover immediately. This distinction is a matter of life and death, highlighting how the word scales from a simple suggestion to a mandatory directive for survival.

Social and Legal Contexts: In a workplace or legal setting, a warning is a formal notice that someone's behavior is unacceptable and that further negative actions will result in punishment, such as being fired or fined.

Without any prior warning, the company announced that it would be closing its main factory by the end of the month.

Furthermore, the word is used to describe the physical signs of an illness. Doctors look for 'warning signs' like a high fever or a persistent cough. In this sense, the body itself is issuing a warning to the individual that something is wrong internally. This metaphorical use extends to economics (warning signs of a recession) and relationships (warning signs of a breakup). It is a word that demands attention and usually requires a response, whether that response is to stop, to change direction, or to prepare for the worst. Its power lies in its ability to prevent a negative outcome before it becomes inevitable.

The dark, heavy clouds served as a natural warning that a severe thunderstorm was approaching the valley.

Grammatical Note: The word is a countable noun. You can have one warning, two warnings, or many warnings. It can also be used as an adjective in compound nouns like 'warning light' or 'warning sign'.

He ignored the warning on the label and accidentally washed his wool sweater in boiling water.

The siren provided a clear warning to everyone in the building to evacuate immediately due to the fire.

Using the word warning correctly involves understanding its role as a noun and its common collocations. Because it is a countable noun, it almost always requires an article (a, an, the) or a possessive pronoun (my, his, their) unless it is in the plural form. One of the most common ways to use it is with the verb 'to give'. For instance, 'The teacher gave the students a warning about their behavior.' This implies a verbal caution. Another frequent verb is 'to issue', which is more formal and often used by organizations or authorities. 'The government issued a travel warning for citizens visiting the region.' This suggests an official announcement.

Prepositional Patterns: We often use 'warning' with the prepositions 'about', 'of', or 'against'. Use 'about' for general topics, 'of' for specific impending events, and 'against' for advice to avoid a specific action.

The health department issued a stern warning against eating raw shellfish during the summer months.

When describing the content of a warning, you can use a 'that' clause. For example, 'There was a warning that the bridge might be icy.' This structure is very common in news reporting and technical documentation. You can also use the word as a modifier for other nouns, creating compound nouns that describe the mechanism of the warning. Common examples include 'warning sign', 'warning light', 'warning bell', and 'warning shot'. In these cases, 'warning' acts like an adjective to tell us the purpose of the sign, light, or bell.

Adjective Collocations: You can modify 'warning' with adjectives to show its intensity: 'stern warning', 'dire warning', 'gentle warning', 'final warning', or 'early warning'.

The sudden drop in temperature was an early warning of the blizzard that would arrive by nightfall.

In more advanced usage, 'warning' can be the subject of a sentence that describes an effect. 'The warning went unheeded, leading to a massive disaster.' Here, 'unheeded' means that people heard the warning but chose to ignore it. You might also 'heed a warning', which means to listen to it and take the necessary precautions. Understanding these pairings—heed/ignore, issue/receive, give/take—will make your use of the word sound much more natural and fluent to native speakers.

The police officer gave the driver a verbal warning instead of writing a ticket for the broken taillight.

Negative Structures: When there is no signal, we say 'there was no warning' or 'it happened without any warning'. This emphasizes the shock of the event.

The earthquake struck at midnight without warning, catching the entire city by surprise.

The computer screen displayed a warning that the hard drive was almost full and needed to be cleaned.

The word warning is ubiquitous in modern life, appearing in almost every environment where safety and information are prioritized. You will hear it most frequently in public announcements, such as at train stations or airports. For example, 'Warning: Please stand behind the yellow line.' In these settings, the word is used to prevent accidents and ensure the smooth flow of people. It is also a staple of digital life. Every time you try to delete a file or visit a potentially insecure website, your operating system or browser will likely present a 'security warning' or a 'warning dialog box'. These digital warnings are designed to protect your data and privacy.

Media and News: News anchors frequently use the word when reporting on weather or health. 'The National Weather Service has issued a flash flood warning for the tri-state area.' In this context, it is a formal, high-stakes term.

The documentary began with a content warning for viewers who might be sensitive to graphic images of war.

In the world of sports, you will hear the word used by officials. In soccer (football), a yellow card is a 'caution' or a 'warning' to a player that their behavior is on the edge of being unacceptable. In baseball, the 'warning track' is the strip of dirt near the outfield wall that tells a player they are running out of room. These physical and symbolic warnings are essential for the rules and safety of the game. Even in entertainment, movies often have 'parental warnings' or 'content warnings' at the beginning to inform the audience about mature themes, violence, or strong language.

Consumer Products: Look at any household cleaner or electronic device. You will see a 'warning label' that provides instructions on how to use the product safely to avoid injury or damage.

The cigarette package carried a graphic health warning about the long-term dangers of smoking to the lungs.

In interpersonal relationships, the word is often used to describe red flags or intuitive feelings. Someone might say, 'I had a warning in my gut that I shouldn't trust him.' This refers to an internal, psychological alert. Furthermore, in literature and film, 'foreshadowing' is a type of narrative warning where the author gives the reader hints about what will happen later in the story. Whether it is a literal sign on a fence that says 'Warning: High Voltage' or a metaphorical 'shot across the bows' in a political debate, the word is a constant presence in how we navigate risks and communicate boundaries.

The car's dashboard lit up with a low-fuel warning just as we were passing the last gas station for fifty miles.

Aviation and Transport: Pilots receive 'terrain warnings' if they are flying too low, and ship captains receive 'gale warnings' about stormy seas. These are high-precision alerts.

The scientist issued a global warning regarding the accelerating rate of polar ice melt and rising sea levels.

The teacher's look was a silent warning to the class that they needed to settle down and start working.

One of the most frequent mistakes learners make with the word warning is confusing it with the verb 'to warn'. Remember that 'warning' is the thing (the noun), while 'warn' is the action (the verb). You cannot say 'I warning you'; you must say 'I am warning you' (verb) or 'I am giving you a warning' (noun). Another common error involves the use of prepositions. Many students mistakenly use 'to' instead of 'about' or 'of'. For example, saying 'a warning to the storm' is incorrect; it should be 'a warning of the storm' or 'a warning about the storm'. However, you can say 'a warning to the public', where 'to' indicates the recipient of the message.

Countability Confusion: Some learners treat 'warning' as an uncountable noun like 'advice'. This is incorrect. You must use 'a' or make it plural. You cannot say 'He gave me warning'; say 'He gave me a warning'.

Incorrect: He gave me some warning about the test. Correct: He gave me a warning about the test.

Another nuance is the difference between 'warning' and 'notice'. While they are similar, a 'notice' is often just information, whereas a 'warning' specifically implies danger or a negative consequence. If you tell someone 'I'm giving you notice,' it might mean you are quitting your job. If you say 'I'm giving you a warning,' it means you are telling them they are doing something wrong. Confusing these two can lead to significant misunderstandings in a professional environment. Additionally, learners sometimes forget that 'warning' can be used as an adjective. They might try to say 'a sign of warning' when 'a warning sign' is the more natural, idiomatic choice.

The 'Without Warning' Trap: Learners often add 'a' to the phrase 'without warning'. It is a fixed idiom. Saying 'without a warning' is grammatically possible but less common than 'without warning'.

The rain started falling without warning, soaking everyone who didn't have an umbrella.

Finally, be careful with the word 'alarm'. While a warning can be an alarm, an alarm is usually the physical device or the feeling of fear. You 'sound the alarm' to 'give a warning'. If you say 'I gave him an alarm,' it sounds like you gave him a physical clock. Use 'warning' for the message itself. Also, pay attention to the intensity. Using 'dire warning' for something small like a late homework assignment is hyperbolic and might sound strange. Match the adjective to the severity of the situation to maintain the correct tone.

The doctor's warning about his high blood pressure was the motivation he needed to start exercising.

Spelling Errors: Many people accidentally spell it 'warning' with two 'n's in the middle (warnning). It only has one 'n' after the 'r'.

The company received a formal warning from the environmental agency for polluting the local river.

The flashing lights on the road were a clear warning to slow down for the construction zone ahead.

While warning is the most common and general term, English offers several synonyms that carry different nuances of formality, urgency, and context. Choosing the right alternative can make your writing more precise. For example, 'caution' is often used for less severe dangers or as a general state of being careful. You might see 'Caution: Hot Surface' on a coffee cup. It is slightly softer than 'warning'. 'Alert' is another common alternative, usually implying a state of readiness or a notification about a sudden change, such as a 'weather alert' or a 'security alert' on your phone.

Warning vs. Caution: A warning usually implies a specific threat that will happen, while caution is a general advice to be careful. Warnings are often more urgent than cautions.

The sign served as a caution to hikers that the trail could be slippery after the rain.

In more formal or literary contexts, you might encounter words like 'admonition' or 'caveat'. An 'admonition' is a firm warning or reprimand, often given by someone in authority regarding behavior. A 'caveat' is a specific warning or limitation to be considered when evaluating something, often used in legal or academic discussions (e.g., 'The results of the study are promising, with the caveat that the sample size was small'). 'Forewarning' is another useful term, specifically emphasizing that the warning was given well in advance of the event.

Urgent Alternatives: 'Alarm' and 'SOS' are used for immediate, life-threatening emergencies where action must be taken in seconds rather than minutes.

The sudden drop in the stock market was a red flag for investors that the economy was in trouble.

Metaphorically, we often use the phrase 'red flag' to describe a warning sign in a person's character or a business deal. 'Omens' and 'portents' are more dramatic, often used in storytelling to describe natural events that are seen as warnings from fate or the gods. In a technical sense, a 'notification' is a neutral way to describe a message, but it becomes a warning if the content involves a problem. Understanding these distinctions allows you to move beyond basic English and express exactly how serious or formal the 'warning' is intended to be.

He ignored the admonition of his elders and decided to travel across the desert alone.

Summary of Alternatives: Use 'heads-up' for friends, 'notice' for information, 'caution' for safety, and 'ultimatum' for a final warning that demands a choice.

The general issued an ultimatum as a final warning before the commencement of military action.

The loud thunder was a forewarning that the picnic would have to be moved indoors.

How Formal Is It?

Formal

Neutral

Informal

Child friendly

Slang

Fun Fact

In the Middle Ages, a 'warning' often referred to a legal summons to appear in court. If you didn't 'heed the warning', you could lose your property or your freedom!

Pronunciation Guide

UK /ˈwɔː.nɪŋ/

US /ˈwɔːr.nɪŋ/

The stress is on the first syllable: WAR-ning.

Rhymes With

morning fawning dawning yawning scorning awning spawning horning

Common Errors

Pronouncing it like 'warming' (with an 'm' instead of an 'n').
Adding an extra syllable like 'warn-ing-uh'.
Not pronouncing the 'ng' at the end clearly.
Stress on the second syllable: war-NING (incorrect).
Confusing the 'or' sound with an 'ar' sound (warning vs warning).

Difficulty Rating

Reading 2/5

The word is easy to recognize in signs and simple texts.

Writing 3/5

Requires knowledge of countability and common prepositions like 'about' or 'of'.

Speaking 2/5

Commonly used in daily life; pronunciation is straightforward.

Listening 2/5

Clear pronunciation makes it easy to hear in announcements.

What to Learn Next

Prerequisites

danger safe sign tell bad

Learn Next

caution prevent hazard advice threat

Advanced

admonition caveat premonition harbinger portent

Grammar to Know

Countable Nouns

You must say 'a warning' or 'warnings', never just 'warning' alone.

Gerunds as Nouns

'Warning' is the gerund of 'warn' acting as a noun.

Prepositional Phrases

Use 'about' for the topic and 'to' for the person receiving it.

Compound Nouns

Warning + Sign = Warning Sign (the first noun acts as an adjective).

Passive Voice

'A warning was given' is common in formal reports.

Examples by Level

The yellow sign is a warning.

Le panneau jaune est un avertissement.

Simple noun usage with the verb 'to be'.

He gave me a warning.

Il m'a donné un avertissement.

Using the verb 'give' with the noun 'warning'.

Look at the warning light.

Regardez le voyant d'avertissement.

'Warning' used as an adjective modifying 'light'.

There is a storm warning today.

Il y a une alerte à la tempête aujourd'hui.

Compound noun 'storm warning'.

The bell is a warning.

La cloche est un avertissement.

Identifying a sound as a warning.

I saw a warning on the box.

J'ai vu un avertissement sur la boîte.

Prepositional phrase 'on the box'.

This is your last warning.

C'est ton dernier avertissement.

Using the adjective 'last' to show finality.

The dog barked as a warning.

Le chien a aboyé en guise d'avertissement.

Using 'as a warning' to show purpose.

The rain started without warning.

La pluie a commencé sans prévenir.

Fixed phrase 'without warning'.

There are many warning signs on the road.

Il y a beaucoup de panneaux d'avertissement sur la route.

Plural noun 'warning signs'.

My phone has a low battery warning.

Mon téléphone a une alerte de batterie faible.

Specific type of digital warning.

The teacher gave a warning about the test.

Le professeur a donné un avertissement à propos du test.

Preposition 'about' used with warning.

She ignored the warning and got hurt.

Elle a ignoré l'avertissement et s'est blessée.

Using the verb 'ignore' with 'warning'.

The siren is a warning of fire.

La sirène est un avertissement d'incendie.

Preposition 'of' used with warning.

He received a warning for being late.

Il a reçu un avertissement pour être en retard.

Using 'receive' and 'for' with warning.

The computer gave a security warning.

L'ordinateur a donné une alerte de sécurité.

Digital context for the noun.

The National Weather Service issued a flood warning.

Le service météorologique national a émis une alerte aux inondations.

Formal verb 'issue' used with 'warning'.

The doctor gave him a stern warning about smoking.

Le médecin lui a donné un avertissement sévère à propos du tabac.

Adjective 'stern' adds intensity.

The label contains a warning against misuse.

L'étiquette contient une mise en garde contre une mauvaise utilisation.

Preposition 'against' used for prohibition.

The sudden silence was a warning to the hunters.

Le silence soudain était un avertissement pour les chasseurs.

Abstract concept acting as a warning.

He was given a written warning by his manager.

Il a reçu un avertissement écrit de la part de son manager.

Passive voice construction.

The bridge has a warning system for high winds.

Le pont possède un système d'alerte pour les vents violents.

Compound noun 'warning system'.

The pilot ignored the warning light on the panel.

Le pilote a ignoré le voyant d'alerte sur le panneau.

Specific professional context.

Take this as a fair warning: the path is dangerous.

Prenez ceci comme un avertissement loyal : le chemin est dangereux.

Idiomatic phrase 'fair warning'.

The economist issued a dire warning about the impending recession.

L'économiste a lancé un avertissement désastreux sur la récession imminente.

Adjective 'dire' and 'impending' increase complexity.

The government's warning went unheeded by the local population.

L'avertissement du gouvernement n'a pas été écouté par la population locale.

Using 'unheeded' to describe the response.

The early warning signs of the disease are often subtle.

Les premiers signes d'alerte de la maladie sont souvent subtils.

Phrase 'early warning signs'.

The company received a final warning regarding its safety violations.

L'entreprise a reçu un dernier avertissement concernant ses violations de sécurité.

Prepositional phrase 'regarding its...'.

The earthquake struck, giving residents almost no warning.

Le tremblement de terre a frappé, ne laissant presque aucun avertissement aux résidents.

Participle phrase 'giving residents...'.

The protest was a warning shot to the political establishment.

La manifestation était un coup de semonce pour la classe politique.

Metaphorical 'warning shot'.

The software provides a warning if you try to exit without saving.

Le logiciel affiche un avertissement si vous essayez de quitter sans enregistrer.

Conditional 'if' clause.

Heeded in time, the warning could have prevented the disaster.

Écouté à temps, l'avertissement aurait pu prévenir la catastrophe.

Past participle used as an adjective phrase.

The report serves as a chilling warning of the consequences of inaction.

Le rapport sert d'avertissement glaçant sur les conséquences de l'inaction.

Adjective 'chilling' and abstract 'inaction'.

The sudden resignation of the CEO was a warning of internal turmoil.

La démission soudaine du PDG était un signe avant-coureur de troubles internes.

Abstract noun 'turmoil'.

Despite repeated warnings, the environmental damage continued unabated.

Malgré des avertissements répétés, les dommages environnementaux se sont poursuivis sans relâche.

Concessive 'despite' and adverb 'unabated'.

The legal team added a specific warning to the contract's fine print.

L'équipe juridique a ajouté un avertissement spécifique aux petits caractères du contrat.

Idiomatic 'fine print'.

The decline in bird populations is a warning of ecological collapse.

Le déclin des populations d'oiseaux est un avertissement d'effondrement écologique.

Scientific/Academic context.

The siren's wail provided a haunting warning to the sleeping town.

Le gémissement de la sirène a fourni un avertissement obsédant à la ville endormie.

Evocative adjectives 'wail' and 'haunting'.

The judge issued a stern warning to the jury against discussing the case.

Le juge a adressé une mise en garde sévère au jury contre toute discussion sur l'affaire.

Legal 'against' construction.

The novel is often read as a warning against totalitarianism.

Le roman est souvent lu comme une mise en garde contre le totalitarisme.

Literary analysis context.

The ominous silence was the only warning before the avalanche descended.

Le silence de mauvais augure fut le seul avertissement avant que l'avalanche ne descende.

Adjective 'ominous' and temporal 'before' clause.

His prophetic warnings about the fragility of the banking system were ignored.

Ses avertissements prophétiques sur la fragilité du système bancaire ont été ignorés.

Adjective 'prophetic' and complex noun phrase.

The document provides a salutary warning to those who seek power at any cost.

Le document fournit un avertissement salutaire à ceux qui recherchent le pouvoir à tout prix.

Adjective 'salutary' (beneficial through hardship).

The recurring motifs in the play act as a warning of the protagonist's downfall.

Les motifs récurrents de la pièce agissent comme un avertissement de la chute du protagoniste.

Literary term 'motifs' and 'protagonist'.

The city's crumbling infrastructure is a stark warning of years of neglect.

L'infrastructure en ruine de la ville est un avertissement flagrant de plusieurs années de négligence.

Adjective 'stark' and abstract 'neglect'.

The treaty included a warning that any breach would result in immediate sanctions.

Le traité incluait un avertissement selon lequel toute violation entraînerait des sanctions immédiates.

Complex 'that' clause with modal 'would'.

The philosopher's warning about the 'banality of evil' remains relevant today.

L'avertissement du philosophe sur la « banalité du mal » reste d'actualité aujourd'hui.

Quotation used as part of the noun phrase.

The sudden shift in wind direction was a precursory warning of the storm's intensity.

Le changement soudain de direction du vent était un avertissement précurseur de l'intensité de la tempête.

Adjective 'precursory'.

Synonyms

alert caution notice alarm signal

Antonyms

safety security reassurance

Common Collocations

give a warning

issue a warning

heed a warning

ignore a warning

stern warning

final warning

early warning

warning sign

without warning

warning light

Common Phrases

Fair warning

— A warning given in advance so that someone has a chance to prepare or avoid trouble.

I'm giving you fair warning: the food at that restaurant is very spicy.

Take warning

— To learn from a bad experience or a signal so that you do not make the same mistake.

You should take warning from his failure and study harder.

Serve as a warning

— To act as an example that shows others what might happen if they are not careful.

Let this accident serve as a warning to everyone who drives too fast.

Warning shot

— A literal or metaphorical action taken to show that you are ready to fight or take serious action.

The new law was a warning shot to companies that pollute the environment.

Content warning

— A notice at the start of a video or book about sensitive material.

The movie has a content warning for violence.

Advance warning

— Information about something before it happens.

We had no advance warning that the company was closing.

Written warning

— A formal document in a workplace describing an employee's bad behavior.

After being late three times, she received a written warning.

Verbal warning

— A spoken caution given by someone in authority.

The referee gave the player a verbal warning for the foul.

Health warning

— A message on a product about how it can hurt your health.

There is a health warning on every pack of cigarettes.

Global warning

— A common mistake for 'global warming', but can refer to alerts about global crises.

The scientist issued a global warning about the pandemic.

Often Confused With

warning vs warn

Warn is the verb (action), while warning is the noun (the thing).

warning vs warming

Warming relates to heat (global warming), warning relates to danger.

warning vs notice

A notice is information; a warning is information about danger.

Idioms & Expressions

"A shot across the bows"

— A warning that you are prepared to take strong action if someone does not change their behavior.

The lawsuit was a shot across the bows for the rival company.

idiomatic

"The writing is on the wall"

— A warning that something bad is going to happen soon and cannot be stopped.

With sales falling every month, the writing is on the wall for the small shop.

idiomatic

"Red sky at night, shepherd's delight; red sky in morning, shepherd's warning"

— An old weather proverb; a red sky in the morning warns of bad weather coming.

The sky was bright red at 6 AM—a shepherd's warning for our hike.

literary/folk

"Heed the call"

— To listen to a warning or a request for action.

He failed to heed the call of the warning sirens and stayed in the house.

formal

"A bolt from the blue"

— Something that happens completely without warning.

The news of her resignation was a bolt from the blue.

idiomatic

"Forewarned is forearmed"

— If you know about a problem in advance, you can prepare for it.

I told him about the difficult questions so he could study; forewarned is forearmed.

proverb

"Bark is worse than one's bite"

— Someone's warnings or threats are much more frightening than what they actually do.

Don't worry about the boss's warnings; his bark is worse than his bite.

idiomatic

"Cry wolf"

— To give a false warning so many times that people stop believing you when there is real danger.

If you keep crying wolf about being sick, no one will help you when you are actually ill.

idiomatic

"Storm clouds on the horizon"

— Warning signs that trouble is coming in the future.

The recent layoffs are storm clouds on the horizon for the local economy.

metaphorical

"Knock on wood"

— Said to avoid 'jinxing' oneself after ignoring a warning or hoping for good luck.

I haven't had a car accident yet, knock on wood.

informal

Easily Confused

warning vs Caution

Both mean being careful.

Caution is often a general state or a milder alert; warning is usually more specific and urgent.

Use caution when walking on ice. The storm warning says to stay home.

warning vs Alert

Both are signals of something happening.

An alert is a notification of a change; a warning is a notification of a threat.

I got an alert that my package arrived. I got a warning that the package was damaged.

warning vs Alarm

Both involve loud sounds and danger.

An alarm is the device or the feeling of fear; a warning is the message itself.

The fire alarm is ringing. It is a warning to leave.

warning vs Advice

Both are things people tell you to help you.

Advice is a suggestion for a good result; a warning is a signal to avoid a bad result.

My advice is to study. My warning is that you will fail if you don't.

warning vs Threat

Both involve something bad happening.

A threat is an intention to hurt someone; a warning is a message to help someone avoid being hurt.

He made a threat to hit me. The sign was a warning that the dog might bite.

Sentence Patterns

This is a [adjective] warning.

This is a big warning.

[Subject] gave a warning about [noun].

The teacher gave a warning about the noise.

There was a warning that [clause].

There was a warning that the road was closed.

Despite the warning, [subject] [verb].

Despite the warning, he went into the forest.

The [noun] serves as a warning of [noun].

The incident serves as a warning of future risks.

[Noun] went unheeded, leading to [noun].

The warning went unheeded, leading to a catastrophe.

It happened without warning.

The rain started without warning.

Look at the warning [noun].

Look at the warning sign.

Word Family

Nouns

Verbs

Adjectives

How to Use It

frequency

Very high in both spoken and written English.

Common Mistakes

I warning you. → I am warning you.
You need the auxiliary verb 'am' because 'warning' here is the present participle of the verb 'warn'.
He gave me warning. → He gave me a warning.
Warning is a countable noun and needs an article like 'a' or 'the'.
A warning to the rain. → A warning of the rain.
Use 'of' to describe what the warning is about when it is an impending event.
The global warning is bad. → Global warming is bad.
Many learners confuse 'warning' (danger) with 'warming' (temperature increase).
I didn't heed to the warning. → I didn't heed the warning.
The verb 'heed' is transitive and does not take the preposition 'to'.

Tips

Use 'a' or 'the'

Since 'warning' is countable, always use an article when it is singular. 'I saw a warning' is correct.

Learn Collocations

Pair 'warning' with 'issue', 'give', 'heed', or 'ignore' to sound more like a native speaker.

One 'N' in the middle

Don't spell it 'warnning'. There is only one 'n' between the 'r' and the 'i'.

Weather Context

In the US, a 'warning' is more serious than a 'watch'. Always take a 'warning' seriously.

Workplace Warnings

A 'written warning' is a serious legal step in many countries. Keep a copy for your records.

Informal Alternative

Use 'heads-up' when talking to friends. It sounds more natural than 'I am giving you a warning'.

Look for Signs

When traveling, look for the word 'Warning' on signs. It is a universal way to stay safe.

Heed the Light

If a 'warning light' appears on your car dashboard, stop and check the manual immediately.

Prepositions

Remember: Warning ABOUT a topic, Warning OF a specific event, Warning AGAINST an action.

Public Alerts

In many countries, a loud, rising and falling siren is the standard 'warning' for an emergency.

Memorize It

Mnemonic

Think of a 'WAR' and a 'RING'. A warning is like a bell (RING) that tells you a fight (WAR) or danger is coming.

Visual Association

Imagine a bright red triangle with an exclamation mark inside it. This is the universal symbol for a warning.

Word Web

Danger Safety Sign Sound Message Future Careful Protect

Challenge

Try to find three different warnings in your house today. Look at food labels, cleaning products, or your computer screen.

Word Origin

The word 'warning' comes from the Old English word 'warnian', which means 'to take heed' or 'to caution'. It is related to the German word 'warnen'. The suffix '-ing' was added to the verb 'warn' to create the noun form, which has been used in English for over a thousand years.

Original meaning: To make someone aware of danger so they can be careful.

Germanic

Cultural Context

Be aware that 'trigger warnings' can be a sensitive topic in academic and social circles.

Warnings are very common in public spaces, from 'Mind the Gap' in the London Underground to 'Caution: Deer Crossing' on American highways.

The story of the Boy Who Cried Wolf (a warning about false warnings). The 'Final Warning' in game shows like 'Who Wants to Be a Millionaire?'. The 'Surgeon General's Warning' on tobacco products.

Practice in Real Life

Real-World Contexts

Weather

tornado warning
flood warning
severe weather warning
winter storm warning

Workplace

written warning
verbal warning
final warning
disciplinary warning

Technology

security warning
low battery warning
error warning
system warning

Health

health warning
warning signs of a stroke
medical warning
early warning signs

Driving

warning sign
warning light
hazard warning
traffic warning

Conversation Starters

"Have you ever received a warning from a police officer while driving?"

"What are some common warning signs of a bad relationship?"

"Do you think people usually heed weather warnings in your city?"

"What is the most serious warning you have ever seen on a product?"

"Should movies have more content warnings for sensitive viewers?"

Journal Prompts

Write about a time you ignored a warning and what happened as a result.

Describe a situation where an early warning saved you from a big problem.

Do you think we have too many warnings in modern life? Why or why not?

Imagine you are a scientist. Write a warning to the world about a new discovery.

What are the 'warning signs' that you are becoming too stressed at work or school?

Frequently Asked Questions

10 questions

It can be both. As a noun, it means the message or sign (e.g., 'The warning was loud'). As a verb, it is the -ing form of 'warn' (e.g., 'He is warning us').

A 'watch' means conditions are possible for a storm. A 'warning' means the storm is actually happening or starting very soon.

It is better to say 'He gave me a warning' or 'He gave me some warnings' because it is a countable noun.

It means something happened suddenly and you did not have any time to prepare for it.

It is a neutral word. It can be used in casual talk ('Just a warning...') or in very formal documents ('Official Warning').

It is a formal letter from an employer to an employee saying their work or behavior is not good enough.

It is pronounced 'WAR-ning'. The first part sounds like the word 'war'.

Literally, it is a gun shot that is not meant to hit anyone but to tell them to stop. Metaphorically, it is any action that shows you are serious about a conflict.

Yes, in phrases like 'warning sign' or 'warning light', it describes the noun that follows.

There is no single word, but 'reassurance' or 'approval' are often the opposite in meaning.