French Idioms Explained (With English Translations)

Why Idioms Matter More Than Vocabulary Lists

Standard vocabulary learning teaches you words. Idioms teach you the shortcuts and metaphors that native speakers use automatically — often without realising they are being idiomatic at all. When a French person says “ça ne casse pas trois pattes à un canard” (literally: “it doesn’t break three legs off a duck”), they mean something is not particularly impressive. The literal meaning is useless. The idiomatic meaning is everything.

Idioms are also a register marker. Using them correctly signals fluency and cultural familiarity far beyond anything a grammar exercise can achieve. Getting them wrong, however, can be memorable in the wrong way — so the context column in this guide matters as much as the translation.

For the broader picture of how register works in French, the guide on slang vs formal French puts idioms in context alongside slang and verlan.

Body-Based Idioms

French has a rich set of idioms built around body parts. These are among the most common in everyday speech.

Animal Idioms

Animals feature heavily in French idioms. Cats, frogs, dogs, cows and chickens all carry specific idiomatic weight.

Poser un lapin is worth highlighting because it is extremely common and its origin is genuinely interesting: in the 19th century, un lapin was slang for refusing to pay (particularly to a prostitute). Over time it came to mean any failure to show up as promised. You will hear it constantly in informal conversation — “Il m’a encore posé un lapin” (“He stood me up again”).

Idioms for Awkward or Difficult Situations

Some of the most useful idioms are those that describe social discomfort, failure, or difficulty — because these are the situations where learners most need precise language.

• avoir le trac — to have stage fright / nerves before a performance or important event. “J’ai le trac avant mon entretien.” (I’m nervous before my interview.)
• se retrouver le bec dans l’eau (literally: to find oneself with your beak in the water) — to be left with nothing, to be left hanging after an expected outcome falls through
• tomber dans les pommes (literally: to fall in the apples) — to faint. Common in everyday speech.
• il ne faut pas pousser mémé dans les orties (literally: don’t push granny into the nettles) — don’t go too far; don’t push your luck. A wonderfully specific image for a universal concept.
• c’est la croix et la bannière — it’s incredibly difficult / a major hassle. Used when something that should be simple turns out to be complicated.

Idioms About Time and Speed

• en deux temps trois mouvements — in two shakes; very quickly. “Il a réglé ça en deux temps trois mouvements.”
• ça ne date pas d’hier — that’s not from yesterday; it’s been around for a long time
• arriver comme un cheveu sur la soupe (literally: to arrive like a hair in the soup) — to show up at an awkward moment; completely ill-timed
• remettre aux calendes grecques — to put off indefinitely; the Greeks had no calends in their calendar, so this means “never”

Idioms You Can Start Using Today

Some idioms are high-frequency and low-risk — meaning they are widely understood, appropriate across contexts, and easy to deploy correctly. These are the ones to learn first.

1. C’est pas la mer à boire. — It’s not the end of the world. (Literally: “It’s not the sea to drink.”) Use it to downplay a difficulty.
2. Ça marche. — That works / sounds good / OK. The go-to informal affirmative.
3. Ça ne casse pas trois pattes à un canard. — It’s nothing special. Use it to express mild underwhelm.
4. Il n’y a pas le feu au lac. — There’s no rush. (Literally: “The lake isn’t on fire.”) Use when someone is panicking unnecessarily.
5. C’est du chinois pour moi. — It’s all Greek to me. (The French use Chinese as their incomprehensible language.)

These idioms connect naturally to everyday conversation. Knowing how to use them well also requires understanding the social dynamics of French speech — the guide on communicating naturally with French people covers the conversational expectations that sit around them.

False Friend Warnings: Idioms That Look Like English But Are Not

A few French idioms are deceptive because they contain words you know, but the combination means something completely different.

• faire la grasse matinée — nothing to do with fat (grasse). It means to have a lie-in, to sleep late. “Demain je fais la grasse matinée.”
• passer du coq à l’âne — nothing to do with roosters or donkeys in a physical sense. It means to jump from one subject to another with no logical connection.
• avoir le coup de barre — nothing to do with a bar or a blow. It means to suddenly feel exhausted, to hit a wall of tiredness.

For the full category of words that look like English translations but are not, the article on French-English false friends covers 50 of the most common traps.