cost an arm and a leg

The idiom cost an arm and a leg is one of the most vivid and frequently used expressions in the English language to denote an exorbitant price. When someone says that a vacation, a new car, or even a simple dinner 'cost an arm and a leg,' they are employing hyperbole—a deliberate exaggeration—to emphasize that the cost was much higher than expected or much higher than what is considered reasonable. It is not merely a synonym for 'expensive'; it carries an emotional weight of shock, frustration, or a sense of significant sacrifice. Historically, while the exact origins are debated, the phrase evokes the idea of a person having to give up something essential and irreplaceable to acquire a material good. In modern usage, it is highly informal but widely accepted in professional settings when speaking colloquially about budgets and expenses.

Literal vs. Figurative

While literally losing limbs would be a physical tragedy, figuratively, it represents the 'pain' of losing a large sum of money. You will almost never hear this used in a literal sense unless in a dark comedy or a medical context involving prosthetic costs.

The phrase is versatile because it can be used for both essential needs and luxury wants. For instance, if a person's car breaks down and the repair bill is astronomical, they might complain that the mechanic charged them an arm and a leg. Conversely, someone might look at a luxury penthouse and remark that living there would cost an arm and a leg. It is often used with modal verbs like 'will,' 'might,' or 'is going to,' indicating a future or hypothetical expense. However, it is equally common in the past tense ('it cost me an arm and a leg') to reflect on a purchase already made. Understanding this idiom is crucial for B1 learners because it appears constantly in television shows, movies, and casual office banter.

Intensity

This phrase is stronger than 'pricey' and more informal than 'exorbitant.' It suggests the price is almost unfairly high.

Furthermore, the phrase is often used to justify why someone *didn't* buy something. It acts as a valid reason for declining an offer or choosing a cheaper alternative. For example, 'We wanted to fly first class, but it would have cost an arm and a leg, so we chose economy instead.' This usage highlights the practical decision-making process influenced by high costs. In terms of social dynamics, using this phrase can create a sense of shared frustration between the speaker and the listener, as most people can relate to the feeling of being overcharged. It builds rapport through common experience of financial pressure.

Contextual Appropriateness

Avoid using this in extremely formal legal documents or academic papers where precise terminology like 'prohibitive costs' is preferred.

Using 'cost an arm and a leg' correctly requires attention to the verb 'cost' and the subject of the sentence. The subject is usually the item or service that is expensive. Because 'cost' is an irregular verb, its forms are 'cost' (present), 'cost' (past), and 'cost' (past participle). This can be confusing for learners who might be tempted to add '-ed' for the past tense. For example, 'The repairs cost an arm and a leg' could be referring to a repair happening now (if 'repairs' is plural) or one that happened yesterday. Context usually clarifies the timing. When using the third person singular, remember to add the 's': 'That car costs an arm and a leg.'

Grammar Focus: Verb Tense

Present: It costs an arm and a leg. Past: It cost an arm and a leg (yesterday). Future: It will cost an arm and a leg.

You can also introduce a person into the idiom by adding 'me,' 'him,' 'her,' or 'us' after the verb 'cost.' This specifies who is paying the high price. 'That wedding cost them an arm and a leg' emphasizes the financial strain on the couple or their families. This personalizes the idiom and makes the story more engaging. You can also use it in the negative to express relief: 'Luckily, the fix didn't cost an arm and a leg.' This shows that the price was surprisingly affordable or at least manageable.

Another common way to structure sentences is to use the 'it' anticipatory subject: 'It costs an arm and a leg to maintain a vintage Ferrari.' Here, the real subject (to maintain a vintage Ferrari) is moved to the end of the sentence for emphasis. This is a very common pattern in spoken English. You might also hear it used as a comparative: 'This house is beautiful, but it's going to cost an arm and a leg more than our current one.' While not a standard comparative structure, it works in informal speech to show a massive difference in price.

Sentence Variation

Try using it with 'would': 'It would cost an arm and a leg to fly to Mars right now.'

Finally, consider the rhythm of the phrase. It is an iambic-leaning expression that flows well at the end of a sentence. 'I'd love to go, but it costs an arm and a leg.' The emphasis naturally falls on 'arm' and 'leg,' which are the most important words in the metaphor. If you want to emphasize the cost even more, you can pause slightly before saying 'an arm and a leg.' This creates a 'drumroll' effect for the listener, preparing them for the shock of the price you are about to describe.

You will encounter 'cost an arm and a leg' in a vast array of real-world situations, primarily in casual conversations among friends, family, and colleagues. It is a staple of 'small talk,' especially when people are complaining about inflation, the cost of living, or specific expensive experiences. If you are standing in line at a grocery store and notice the price of eggs has doubled, the person behind you might sigh and say, 'These eggs are starting to cost an arm and a leg!' This usage serves as a social lubricant, allowing strangers to bond over a shared grievance.

Popular Media

In sitcoms like 'Friends' or 'The Big Bang Theory,' characters often use this idiom when discussing their financial struggles or extravagant purchases. It's a quick way for scriptwriters to establish that a character is feeling stressed about money.

In the workplace, while you might use more formal language in a board meeting, you will definitely hear this idiom in the breakroom or during informal project updates. A project manager might say, 'We need to find a different vendor because the current one is costing us an arm and a leg.' In this context, it signals a need for cost-cutting without sounding overly technical. It is also very common in travel vlogs and reviews. A YouTuber might warn their audience, 'The hotels in this part of Tokyo are great, but they will cost you an arm and a leg, so book in advance!'

Advertising and marketing also occasionally use this idiom, though often in the negative to highlight their own affordability. A budget airline might run an ad saying, 'Travel to Europe shouldn't cost an arm and a leg. Fly with us for less.' By using the idiom, the brand positions itself as the 'friend' of the consumer, understanding their fear of high prices. You will also hear it in news segments discussing the economy. A reporter might interview a citizen about rising gas prices, and the citizen will inevitably use the phrase to describe the impact on their daily budget.

Geographic Reach

This idiom is universally understood across the UK, USA, Canada, Australia, and New Zealand, making it a safe bet for any English-speaking environment.

Interestingly, the phrase is also common in literature and journalism when the author wants to adopt a more relatable, conversational tone. A columnist writing about the high price of healthcare might use it to immediately grab the reader's attention and evoke sympathy. It bridges the gap between the abstract concept of 'high costs' and the tangible reality of personal sacrifice. Even in podcasts focused on personal finance, experts use it to describe 'lifestyle creep'—when your habits start to cost an arm and a leg without you noticing.

One of the most frequent mistakes learners make with 'cost an arm and a leg' is related to the anatomy involved. Because it's a fixed idiom, you cannot change the body parts. You cannot say 'it cost a hand and a foot' or 'it cost an eye and an ear.' While these might logically mean the same thing, they are not recognized idioms and will sound very strange to a native speaker. The specific combination of one arm and one leg is non-negotiable. Similarly, always use 'an' before arm and 'a' before leg. Saying 'cost arm and leg' without the articles is grammatically incorrect and disrupts the natural flow of the phrase.

Common Error: Pluralization

Incorrect: It cost two arms and two legs. Correct: It cost an arm and a leg. Even if something is double the price, the idiom stays singular.

Another error involves the verb 'cost' itself. As mentioned, the past tense of cost is cost. Many students mistakenly say 'It costed an arm and a leg.' This is a common over-regularization error. Additionally, learners sometimes confuse the preposition. It is always 'cost (someone) an arm and a leg,' not 'cost for an arm and a leg.' The direct object of the verb 'cost' is the price (the arm and leg), so no preposition is needed between the verb and the idiom. If you want to mention the person paying, they come immediately after 'cost': 'It cost me an arm and a leg.'

Contextual mistakes also occur. Using this idiom for something that is only slightly expensive can come across as overly dramatic or sarcastic. If a cup of coffee is $5, saying it 'cost an arm and a leg' might be seen as a joke, but if you say it seriously, people might think you are out of touch with reality. Reserve the idiom for costs that are genuinely significant relative to the item. Furthermore, avoid using it in very formal writing like a legal contract or a scientific paper. In those cases, use 'prohibitive' or 'substantial expense.' Using idioms in formal writing can sometimes make the author seem less professional.

Article Usage

Don't forget the 'an' and the 'a'. 'Cost arm and leg' is a very common mistake for speakers of languages without articles.

While 'cost an arm and a leg' is a great idiom, having alternatives helps you vary your speech and match the level of formality required. A very close synonym is 'to pay through the nose.' This also implies paying a very high price, often more than what is fair. Another common idiom is 'to break the bank.' This is often used in the negative: 'I want a nice car that won't break the bank,' meaning a car that is affordable. If you want to be more formal, you can use words like 'exorbitant,' 'extravagant,' or 'prohibitive.' For example, 'The costs were prohibitive, so we cancelled the project.'

Comparison: Break the Bank vs. Cost an Arm and a Leg

'Break the bank' usually refers to the total budget being exhausted, while 'cost an arm and a leg' emphasizes the high price of a single item.

In slang, especially in the UK, you might hear 'it cost a small fortune.' This is slightly more polite than 'arm and a leg' but still conveys the same idea of a high price. In American slang, people might say something is 'spendy' or 'pricey.' If you want to describe a price that is so high it feels like a crime, you can say 'that's highway robbery.' This is a very strong expression used when you feel cheated or when a price is outrageously high for no good reason. On the other end of the spectrum, if something is cheap, you can say it 'cost peanuts' or was 'a steal.'

There are also more modern, tech-adjacent ways of saying something is expensive. People might say an item has a 'premium price point' in business contexts. If you are talking about the value over time, you might say it has a 'high cost of ownership.' However, none of these quite capture the visceral, physical imagery of 'costing an arm and a leg.' The idiom remains the king of casual emphasis. For B1 learners, mastering 'arm and a leg' and 'break the bank' provides a solid foundation for discussing finances in English.

Formal Alternatives

Exorbitant: Extremely high (often used for interest rates or fees). Prohibitive: So high that it prevents you from doing something.