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A1 noun #1,647 le plus courant 11 min de lecture

finger

Top 1,647

At the A1 level, the word 'finger' is introduced as a basic, essential noun related to the human body. Learners at this stage are focusing on identifying their immediate physical surroundings and themselves. 'Finger' is taught alongside words like 'hand', 'arm', 'leg', 'head', and 'foot'. The primary goal is simple identification. A learner should be able to point to their hand and say, 'These are my fingers.' They learn that a typical person has ten fingers in total, five on each hand. The grammatical focus is on basic pluralization (finger -> fingers) and using possessive adjectives correctly, such as 'my finger' or 'your finger'. Simple actions are also introduced, like 'touch with your finger' or 'point your finger'. At this stage, the distinction between fingers (on the hand) and toes (on the foot) is strongly emphasized to prevent common translation errors from other languages. The vocabulary is kept concrete and literal, avoiding any idiomatic or metaphorical uses. Visual aids, such as diagrams of a hand, are heavily used to reinforce the connection between the word and the physical body part. Mastery at this level means being able to confidently name the body part and use it in very simple, descriptive sentences.

Moving to the A2 level, the usage of 'finger' expands beyond simple identification to include more dynamic actions and descriptions. Learners begin to combine 'finger' with a wider variety of verbs. They learn phrases like 'cut my finger', 'burn my finger', or 'break a finger', which are essential for describing minor injuries or health issues to a doctor or friend. The vocabulary surrounding the word grows to include related items, such as wearing a 'ring' on a finger or wearing 'gloves' to keep fingers warm. Learners also start to differentiate the fingers by their common names: thumb, index finger, middle finger, ring finger, and pinky (or little finger). This allows for more precise communication. For example, instead of just saying 'my finger hurts', an A2 learner might say 'my thumb hurts'. Furthermore, simple compound words might be introduced, such as 'fingernail'. The focus remains on literal, everyday situations, but the sentences become more complex, incorporating prepositions of place (e.g., 'the ring is on my finger') and basic past tense verbs to recount events involving their hands.

At the B1 intermediate level, learners encounter 'finger' in more varied and slightly abstract contexts. While physical descriptions remain important, the word starts to appear in common, easily understood idioms and phrasal verbs. For instance, the cultural gesture and phrase 'cross your fingers' (meaning to hope for good luck) is introduced. Learners might also see 'finger' used as a verb for the first time, meaning to touch or handle something, though this is less common. The vocabulary expands to include terms like 'fingerprint', which is useful for discussing topics related to crime, security, or technology (like unlocking a phone). At this stage, learners are expected to understand instructions that involve fine motor skills, such as 'use your fingers to mix the ingredients' in a recipe context. They also begin to understand the role of fingers in playing musical instruments, like 'fingering chords on a guitar'. The language becomes more descriptive, using adjectives to describe fingers as 'long', 'slender', 'stubby', or 'nimble'. The focus shifts from merely naming the body part to using it to describe actions, skills, and common cultural expressions.

By the B2 upper-intermediate level, the word 'finger' is firmly established, and the focus shifts heavily towards idiomatic expressions, metaphorical usage, and nuanced communication. Learners are expected to understand and use phrases where 'finger' does not literally mean the body part. Examples include 'to have a finger in every pie' (to be involved in many different activities), 'to point the finger at someone' (to blame someone), or 'to let something slip through your fingers' (to miss an opportunity). These idioms require an understanding of the cultural and figurative extensions of the word. Furthermore, learners encounter more specialized vocabulary, such as 'fingertip' (often used in the phrase 'to have information at your fingertips', meaning readily available). The use of 'finger' in compound adjectives, like 'sticky-fingered' (prone to stealing) or 'butter-fingered' (clumsy), might also be explored. At this level, students can comfortably read and discuss texts where fingers are used to convey emotion or tension, such as 'drumming one's fingers' to show impatience. The mastery of 'finger' at B2 demonstrates a strong grasp of English idioms and the ability to move beyond literal translations.

At the C1 advanced level, learners possess a comprehensive understanding of the word 'finger' and its myriad applications in English. They navigate complex, subtle idioms with ease and can use them appropriately in both spoken and written contexts. Phrases like 'to work one's fingers to the bone' (to work extremely hard) or 'to not lift a finger' (to do absolutely nothing to help) are used naturally. Learners at this stage appreciate the stylistic and rhetorical uses of the word in literature and journalism. They understand how the word can be used to create vivid imagery, such as describing a coastline as having 'fingers of land reaching into the sea'. The verb form of 'finger' is understood in its various nuances, including its use in musical contexts (to finger a piece of music) or in informal contexts (to finger someone for a crime, meaning to identify them as the culprit). C1 learners can engage in discussions about the evolution of language, perhaps noting how technology has created new collocations like 'fat-finger error' in typing or finance. Their vocabulary is rich, precise, and highly idiomatic.

At the C2 mastery level, the learner's command of the word 'finger' is indistinguishable from that of a highly educated native speaker. They possess an intuitive grasp of the word's deepest cultural, historical, and literary resonances. They can effortlessly deploy obscure or highly specific idioms, understanding their exact connotations and appropriate registers. For example, they might use phrases like 'to put one's finger on something' (to identify exactly what is wrong or what is happening) with perfect timing in a complex debate. They are sensitive to the subtle differences between near-synonyms and related terms, knowing exactly when to use 'digit', 'appendage', or 'finger' for maximum rhetorical effect. In creative writing or advanced academic discourse, they can invent novel metaphors based on the concept of a finger, trusting their deep understanding of the language's underlying structures. They are also aware of regional variations in idioms involving fingers across different English-speaking countries. At this ultimate level, 'finger' is not just a vocabulary word; it is a versatile tool for precise, evocative, and sophisticated communication.

Entraîne-toi Exemples Notes et astuces

finger en 30 secondes

A body part on the hand.
Used for touching and holding.
Most people have ten in total.
Often includes the thumb.

The word 'finger' refers to one of the five elongated, jointed digits attached to the human hand. In anatomical terms, while the thumb is often distinguished from the other four digits due to its unique opposable structure, in everyday language, it is commonly counted as one of the five fingers. Fingers are essential for a vast array of human activities, primarily involving the sense of touch, fine motor skills, and the ability to grasp, hold, and manipulate objects of various sizes and shapes.

Anatomy: Each finger is composed of three bones called phalanges, except for the thumb, which has two. They are connected by hinge joints that allow them to bend and extend.

She accidentally cut her finger while chopping vegetables in the kitchen.

Beyond their physical structure, fingers are highly sensitive. The fingertips contain a dense network of nerve endings, making them one of the primary areas of the body used for tactile exploration. This sensitivity allows humans to distinguish between different textures, temperatures, and pressures, which is vital for interacting safely and effectively with the environment. From reading Braille to playing complex musical instruments like the piano or guitar, the dexterity and sensitivity of the fingers are unparalleled.

Functionality: Fingers enable fine motor control, allowing for precise movements required in writing, typing, and crafting.

He wore a beautiful gold ring on his index finger.

In many cultures, individual fingers have specific names and symbolic meanings. The index finger, or pointer finger, is typically used for pointing and indicating direction. The middle finger is the longest. The ring finger is traditionally where wedding bands are worn in many Western cultures, stemming from an ancient belief that a vein ran directly from this finger to the heart. The smallest finger is known as the little finger or pinky. Understanding these distinctions is important for mastering English vocabulary related to the body.

Cultural Significance: Fingers are often used in non-verbal communication, such as pointing, counting, or making specific gestures that carry cultural meaning.

The baby wrapped her tiny hand around her father's finger.

The word 'finger' can also be used as a verb, meaning to touch or feel something with the fingers, often in a nervous or absent-minded way. Furthermore, the concept of a finger extends into numerous idioms and metaphorical expressions in English, highlighting its deep integration into the language. For example, 'having a finger in every pie' means being involved in many different activities. The versatility of the word makes it a foundational piece of vocabulary for any English learner, bridging the gap between basic anatomical terms and complex, figurative language.

Please do not point your finger at people, as it is considered rude.

She snapped her fingers to the rhythm of the catchy music playing on the radio.

Using the word 'finger' correctly involves understanding its grammatical role primarily as a countable noun, and occasionally as a verb. As a noun, it follows standard pluralization rules by adding an 's' to become 'fingers'. You will frequently use it in conjunction with possessive adjectives (my, your, his, her, its, our, their) because fingers are personal body parts. For example, you would say 'my finger hurts' rather than 'the finger hurts' when referring to yourself. This is a common pattern for body parts in English.

Noun Usage: Used to identify the digits on the hand. Often preceded by descriptive adjectives like 'long', 'thin', 'broken', or 'dirty'.

He burned his finger on the hot stove.

When describing actions involving fingers, English employs specific verbs that collocate naturally with the word. Common verbs include 'point', 'snap', 'cross', 'tap', and 'wrap'. For instance, 'crossing your fingers' is a physical action that also serves as a cultural gesture for wishing good luck. 'Tapping your fingers' often indicates impatience or keeping time with music. Understanding these verb-noun pairings is crucial for sounding natural and fluent. Additionally, prepositions play a key role; you wear a ring 'on' your finger, and a splinter might get 'under' your fingernail.

Verb Collocations: Common actions include pointing, snapping, tapping, and crossing.

She crossed her fingers and hoped for the best outcome.

In more advanced usage, 'finger' appears in numerous compound words and phrases. 'Fingertip' refers to the very end of the finger, 'fingernail' is the hard protective covering at the tip, and 'fingerprint' is the unique pattern of ridges on the fingertip used for identification. Learning these related terms expands your vocabulary efficiently. Furthermore, idioms like 'to have a green thumb' (meaning to be good at gardening) or 'to point the finger at someone' (meaning to blame them) show how body parts are deeply embedded in figurative language.

Compound Words: Words like fingerprint, fingernail, and fingertip are formed by combining 'finger' with other nouns.

The detective found a clear fingerprint on the glass.

He tapped his fingers impatiently on the desk while waiting.

She gently ran her fingers through her dog's soft fur.

The word 'finger' is ubiquitous in the English language, appearing across a wide spectrum of contexts from everyday casual conversation to specialized fields like medicine and technology. In daily life, you will hear it constantly when people discuss physical actions, injuries, or personal adornment. Conversations about cooking often involve instructions like 'use your fingers to mix the dough,' while discussions about jewelry naturally involve rings worn on specific fingers. It is a foundational word that children learn very early on when identifying body parts.

Everyday Conversation: Used frequently when talking about touching, holding, or wearing items like rings and gloves.

I need a bandage because I cut my finger on a piece of paper.

In medical and healthcare settings, 'finger' is used to describe symptoms, injuries, or procedures. Doctors might ask if you have numbness in your fingers, or a nurse might prick your finger for a blood test. In the realm of technology, the rise of touchscreens has made the word even more prominent. We talk about 'swiping with a finger,' 'fingerprint recognition' for unlocking smartphones, and 'fat-finger errors' when someone accidentally types the wrong key on a small keyboard. This shows how ancient vocabulary adapts to modern contexts.

Technology Context: Commonly heard in relation to touchscreens, biometric security, and typing.

Use your finger to swipe right on the screen.

Furthermore, you will encounter the word 'finger' extensively in literature, music, and idiomatic expressions. Songs often mention holding fingers or rings on fingers to symbolize love and commitment. In news and politics, you might hear phrases like 'pointing the finger' when discussing blame or accountability. Sports commentary might describe a basketball player having 'a soft touch with their fingers.' The sheer variety of environments where this word appears underscores its importance and the necessity for learners to grasp its multiple dimensions.

Idiomatic Usage: Heard in phrases like 'keep your fingers crossed' or 'slip through your fingers'.

The politician was quick to point the finger at his opponents.

The children loved eating chocolate biscuits shaped like long fingers.

She has a ring on almost every finger.

One of the most frequent mistakes English learners make regarding the word 'finger' is confusing it with 'toe'. In some languages, the same word is used for the digits on both the hands and the feet, sometimes distinguished only by adding 'of the hand' or 'of the foot'. In English, however, the distinction is absolute: 'fingers' are exclusively on the hands, and 'toes' are exclusively on the feet. Saying 'I stubbed the finger on my foot' sounds entirely incorrect to a native speaker and can cause momentary confusion.

Finger vs. Toe: Never use 'finger' to refer to the digits on your feet. Always use 'toe' for feet.

Incorrect: My foot fingers are cold. Correct: My toes are cold, but my fingers are warm.

Another common area of confusion involves the thumb. While anatomically distinct, in casual English, the thumb is often counted as one of the five fingers. However, if someone asks 'how many fingers do you have?', saying 'eight' (excluding the thumbs) is technically anatomically precise but socially unusual; most people will say 'ten'. Yet, when specifying, we differentiate: 'I have four fingers and one thumb on each hand.' Learners sometimes struggle with this dual classification, unsure whether to include the thumb when the word 'finger' is used generally.

Thumb Inclusion: In general conversation, 'fingers' usually includes the thumbs, making ten in total.

She held up three fingers to show how many tickets she needed.

Grammatically, learners sometimes forget to use possessive adjectives with body parts. Instead of saying 'I washed the fingers,' which sounds unnatural and detached, one should say 'I washed my fingers.' This rule applies to almost all body parts in English. Additionally, pluralization errors occur, though less frequently. 'Finger' is a regular noun, so it simply takes an 's' to become plural. Avoid irregular pluralizations or leaving it singular when referring to multiple digits. Mastering these small details significantly improves the natural flow of your English.

Possessive Adjectives: Always use words like 'my', 'your', 'his', or 'her' before 'finger' when indicating whose it is.

He accidentally hit his finger with the hammer.

She pointed her index finger at the map to show the location.

Make sure to clean under your fingernails when washing your hands.

When expanding your vocabulary around the word 'finger', it is helpful to learn the specific names for each digit, as well as broader anatomical terms. The most formal and scientific synonym for finger is 'digit'. A digit can refer to either a finger or a toe. In medical or highly formal contexts, you might hear doctors refer to the 'digits of the hand'. However, in everyday conversation, 'finger' is overwhelmingly preferred. Understanding these synonyms helps you navigate different registers of English, from casual chats to reading scientific articles.

Digit: A formal or scientific term for a finger or a toe. Used mostly in anatomy or formal writing.

The human hand typically has five digits, commonly known as fingers and a thumb.

To be more precise, English has specific names for each of the five fingers. The first, though technically distinct, is the 'thumb'. Next is the 'index finger', also commonly called the 'pointer finger' because it is used for pointing. The middle one is simply the 'middle finger'. The fourth is the 'ring finger', named for the cultural tradition of wearing wedding rings there. Finally, the smallest finger is the 'little finger', or very commonly in informal English, the 'pinky'. Knowing these specific terms is crucial for clear communication.

Specific Names: Thumb, index (pointer), middle, ring, and little (pinky) finger.

She promised by linking her pinky finger with his.

Other related words describe parts of the finger. The 'knuckle' is the joint where the finger bends. The 'fingertip' is the very fleshy end of the finger, highly sensitive to touch. The 'fingernail' is the hard, keratinous plate at the tip. While these are not direct synonyms for 'finger', they belong to the same semantic field and are essential for describing actions or injuries in detail. For example, you might scrape your knuckle, burn your fingertip, or paint your fingernails. Grouping these words together aids in vocabulary retention.

Related Parts: Knuckle (joint), fingertip (end), fingernail (hard cover).

He tapped his fingertips together while thinking deeply.

The cold wind made his knuckles turn white.

She painted her fingernails a bright shade of red.

How Formal Is It?

Formel

Informel

Argot

Niveau de difficulté

Grammaire à connaître

Exemples par niveau

I have five fingers on my left hand.

Basic counting of body parts.

Uses the plural 's' for a regular noun.

This is my finger.

Identifying a single body part.

Uses the singular form with a demonstrative pronoun.

She has a ring on her finger.

Describing wearing jewelry.

Uses the preposition 'on' for location.

My finger hurts.

Expressing basic pain.

Simple present tense with a singular subject.

Point your finger at the board.

Following a simple instruction.

Imperative sentence structure.

He cut his finger.

Describing a minor accident.

Past tense of the irregular verb 'cut'.

Wash your hands and fingers.

Hygiene instruction.

Compound object connected by 'and'.

The baby has tiny fingers.

Describing size.

Adjective 'tiny' modifying the noun.

She burned her finger while cooking dinner.

Action causing injury.

Past continuous context implied by 'while'.

He snapped his fingers to the music.

Making a sound with hands.

Collocation 'snap fingers'.

I cannot get this ring off my finger.

Struggling with an object.

Phrasal verb 'get off'.

The gloves keep my fingers warm in winter.

Clothing purpose.

Verb 'keep' + object + adjective.

She painted her fingernails pink.

Grooming action.

Compound word 'fingernails'.

He pointed his index finger at the map.

Specific finger name.

Use of specific vocabulary 'index finger'.

Don't touch the glass with your dirty fingers.

Negative imperative.

Negative command.

She crossed her fingers for good luck.

Cultural gesture.

Common cultural idiom introduced literally.

The police found his fingerprints on the weapon.

Crime investigation context.

Compound noun 'fingerprints'.

She has a lot of rings on her fingers.

Describing quantity.

Quantifier 'a lot of'.

He drummed his fingers on the desk impatiently.

Showing emotion through action.

Verb collocation 'drummed fingers'.

Use your fingertips to gently massage the scalp.

Specific part of the finger.

Compound noun 'fingertips'.

The cold wind made my fingers go numb.

Physical sensation.

Causative verb 'made' + base verb.

She slipped the golden ring onto her ring finger.

Specific action and location.

Preposition 'onto'.

He accidentally hit his thumb with the hammer instead of the nail.

Differentiating digits.

Contrasting thumb with general fingers.

I'll keep my fingers crossed that you pass the exam.

Idiomatic expression of hope.

Idiom used in a complex sentence.

She always seems to have a finger in every pie.

Involved in many things.

Idiomatic expression.

It's not fair to point the finger at him without any evidence.

Blaming someone.

Idiom 'point the finger'.

The opportunity slipped through my fingers because I hesitated.

Missed chance.

Metaphorical usage.

He has all the information he needs right at his fingertips.

Easily accessible.

Idiom 'at his fingertips'.

She worked her fingers to the bone to provide for her family.

Worked extremely hard.

Strong idiomatic exaggeration.

The pianist's nimble fingers flew across the keyboard.

Describing skill and agility.

Adjective 'nimble' indicating dexterity.

I can't quite put my finger on what's wrong with this picture.

Identify exactly.

Idiom 'put my finger on'.

He didn't lift a finger to help us clean up the mess.

Did absolutely nothing.

Negative idiom.

The CEO was accused of having sticky fingers regarding the company's pension fund.

Prone to stealing.

Compound adjective idiom.

She wrapped the entire committee around her little finger with her persuasive presentation.

Easily controlled them.

Complex idiom indicating manipulation or charm.

The suspect was fingered by an anonymous informant.

Identified as guilty.

Verb usage in a criminal context.

Long fingers of fog crept through the valleys as the sun set.

Metaphorical description.

Poetic/metaphorical noun usage.

A fat-finger error on the trading floor cost the bank millions of dollars.

Typing mistake.

Modern compound noun.

He's notoriously butter-fingered, so don't let him hold the antique vase.

Clumsy, likely to drop things.

Compound adjective.

The intricate fingering required for this violin concerto takes years to master.

Musical technique.

Gerund noun specific to music.

They were caught red-handed, with their fingers in the till.

Stealing money.

Combined idioms for emphasis.

The author's latest novel has its finger on the pulse of contemporary youth culture.

Aware of current trends.

Complex idiom indicating acute awareness.

He gave the proposal a definitive thumbs-down, not even deigning to lift a finger in its defense.

Total rejection and lack of support.

Combining related digit idioms.

The delicate tracery of the frost formed icy fingers across the windowpane.

Literary imagery.

Evocative literary metaphor.

She managed to extract the truth, prizing it from his tightly clenched metaphorical fingers.

Forcing someone to reveal something.

Extended metaphor.

The scandal left a lingering taint, a sticky residue that clung to the fingers of all involved.

Lasting negative effect.

Abstract metaphorical usage.

He played the complex sonata with a lightness of touch, his fingers barely seeming to graze the keys.

Extreme delicacy.

Descriptive phrase emphasizing finesse.

The government's heavy-handed intervention was seen as meddling, inserting its fingers where they didn't belong.

Unwanted interference.

Political metaphor.

In the grand tapestry of history, this event is but a snap of the fingers.

A very brief moment.

Idiom used to denote brevity in a grand context.

Synonymes

digit extremity appendage pointer pinky

Antonymes

toe palm

Collocations courantes

point a finger

cross your fingers

snap your fingers

index finger

middle finger

ring finger

little finger

broken finger

sticky fingers

long fingers

Phrases Courantes

keep your fingers crossed

point the finger at

slip through your fingers

have a finger in every pie

work your fingers to the bone

not lift a finger

put your finger on it

wrap around your little finger

butter fingers

fat finger

Souvent confondu avec

finger vs toe

finger vs figure

finger vs thumb

Expressions idiomatiques

Facile à confondre

finger vs

Structures de phrases

Comment l'utiliser

general

A fundamental vocabulary word for A1 learners, essential for describing the body and simple actions.

thumb inclusion

While anatomically a thumb is different, in everyday English, people often say they have 'ten fingers'.

Erreurs courantes

Using 'finger' to describe a toe.
Saying 'the finger' instead of 'my finger' when talking about oneself.
Pronouncing it with a soft 'j' sound instead of a hard 'g'.
Confusing the spelling of 'finger' and 'figure'.
Forgetting to add 's' for plural when talking about more than one.

Astuces

Use Possessives

Always use 'my', 'your', 'his', 'her', etc., before 'finger'. Say 'My finger hurts', not 'The finger hurts'.

Hands vs. Feet

Never use 'finger' for your feet. Hands have fingers, feet have toes. This is a strict rule in English.

Hard G Sound

Make sure to pronounce the 'g' in finger. It sounds like the 'g' in 'go', not the 'g' in 'gym'.

Crossing Fingers

If someone says 'fingers crossed', they are wishing you good luck. You can reply 'Thank you!'

Don't confuse with Figure

Finger has an 'n'. Figure has a 'u'. They look similar but mean very different things.

Learn the Names

Memorize the specific names: thumb, index, middle, ring, and pinky. It makes your English sound much more natural.

Finger in every pie

If someone is involved in many different projects or activities, you can say they have 'a finger in every pie'.

Pointing

The verb 'point' is almost always followed by 'finger'. 'He pointed his finger at the door.'

Fingertip and Fingerprint

Learn these useful compound words. Fingertip is the end of the finger. Fingerprint is the mark it leaves.

Thumbs Up

While the thumb is a finger, the phrase 'thumbs up' is specific to the thumb and means 'good job' or 'okay'.

Mémorise-le

Moyen mnémotechnique

Think of 'FIVE' and 'FINGER'. Both start with F and you have five fingers on a hand.

Origine du mot

Old English

Contexte culturel

Rings are typically worn on the fourth finger.

Crossing fingers means hoping for luck. Pointing is often rude.

Pratique dans la vie réelle

Contextes réels

Amorces de conversation

"Have you ever broken a finger?"

"Do you wear any rings on your fingers?"

"Can you snap your fingers loudly?"

"What do you call the smallest finger in your language?"

"Do you know any idioms that use the word 'finger'?"

Sujets d'écriture

Describe a time when you hurt your finger.

Write about a skill that requires fast or strong fingers (like playing piano or rock climbing).

Explain the meaning of the idiom 'to keep your fingers crossed' and describe a time you did this.

List all the things you are wearing on your hands and fingers right now.

Write a short story about a magic ring found on a mysterious finger.

Questions fréquentes

10 questions

Anatomically, the thumb is distinct from the other four fingers because it has only two bones instead of three and is opposable. However, in everyday casual English, people usually include the thumb when counting and say they have ten fingers. If you need to be precise, you say 'four fingers and a thumb'.

Fingers are located on your hands, while toes are located on your feet. In English, these two words are never interchangeable. Using 'finger' to describe a toe is a very common mistake for learners whose native language uses the same word for both.

It is pronounced /ˈfɪŋ.ɡər/. The important thing to note is the hard 'g' sound in the middle. It does not sound like the soft 'g' in 'ginger'. It rhymes with 'linger'.

Starting from the thickest one: thumb, index finger (or pointer finger), middle finger, ring finger, and little finger (or pinky).

This is a very common idiom. It means to hope for good luck or a positive outcome. People often physically cross their middle finger over their index finger when saying this.

Yes, it can. As a verb, it means to touch or handle something with your fingers. For example, 'He nervously fingered the coins in his pocket.' In informal slang, it can also mean to identify someone to the police.

The fourth finger is called the ring finger because, in many Western cultures, it is the traditional place to wear a wedding ring. This comes from an old belief that a vein ran directly from this finger to the heart.

This is a modern slang term, mostly used in technology and finance. It refers to a mistake made when typing on a keyboard or touchscreen because the person's finger hit the wrong key, often causing a significant problem.

You should always say 'I washed my fingers'. In English, we almost always use possessive adjectives (my, your, his, her) when talking about body parts, rather than the definite article 'the'.

The plural is 'fingers'. It is a completely regular noun. You just add an 's' to the end.