10 French Expressions Everyone Should Know

The most useful French expressions are the ones no textbook translates for you. The words say one thing, but the French mean another. That is why idioms confuse so many new learners.

This is our original collection of ten idioms, rebuilt as a learning tool. For each one you get the literal words, the real meaning, an example you can copy, and where the image comes from.

Learn these and people start speaking to you differently. Native speakers stop simplifying their words, because you have started speaking their French.

Idioms are the difference between textbook French and real spoken French. A French speaker says c'est du gâteau without thinking. If you only know the word-for-word meaning, the sentence sounds like nonsense about cake. Ten moments like that in one conversation, and you are lost.

They also give you a lot of value for very few words. Ten expressions open up hundreds of everyday conversations, because these exact phrases carry the feeling behind what people say.

Examiners notice them too. In TEF and TCF speaking tasks, a well-placed idiom shows natural, native-like language. That is the kind of detail that pushes an Expression Orale score up.

1. C'est du gâteau

The French cousin of "a piece of cake." When a task turns out easier than expected, this is the phrase. It is usually the first idiom French learners make their own.

• Example: J'ai fini mon projet ! C'était du gâteau ! (I finished my project! It was a piece of cake, so easy!)
• The image: cake is pure pleasure. Eating a slice is the easiest thing you will do all day.

2. Au ras des pâquerettes

Literally "at the level of the daisies," which means barely off the ground. Use it for humour, remarks, or quality that aims low. It is a playful way to judge something: critical, but with style.

• Example: Il a un humour au ras des pâquerettes. (His humour is pretty lowbrow.)
• The image: daisies grow very close to the ground. So does anything described this way.

3. Mettre la main à la pâte

"To put your hand in the dough." It means to join in and help with the work.

• Example: Nous devons tous mettre la main à la pâte. (We all have to pitch in.)
• The image: bread does not knead itself. Helping means getting your hands in the dough.

4. Grosso modo

Latin, adopted whole into everyday French. It means roughly, approximately, broadly speaking. You will hear it in offices and kitchens alike.

• Example: Dis-moi grosso modo ce que tu en penses. (Tell me roughly what you think.)
• The image: none needed. It is Latin for "in a rough manner," and the French kept it.

5. Chacun voit midi à sa porte

"Everyone sees noon at their own door." It means people judge by their own point of view, and arguing rarely changes that. It is the famous French shrug, said out loud.

• Example: Inutile de discuter, chacun voit midi à sa porte. (No point arguing; everyone sees it their own way.)
• The image: before clocks, people read the hour from the sun's angle at their own doorstep. So everyone's "noon" was slightly their own.

6. Avoir le cafard

"To have the cockroach." It means to feel low, sad, or blue. Every language needs this phrase; French gave it an insect.

• Example: Je ne sais pas pourquoi, mais j'ai le cafard. (I don't know why, but I'm feeling down.)
• The origin: credited to the poet Charles Baudelaire, who linked the cockroach to a creeping dark mood in Les Fleurs du mal (1857).

7. Être un boute-en-train

The person who brings a room to life: the life of the party. It is a warm compliment, and a useful one at any French dinner.

• Example: Elle a toujours été un boute-en-train. (She's always been the life of the party.)
• The image: the boute-en-train was literally the one who "sets the train in motion." In other words, the person who starts the good mood.

8. Raconter des salades

"To tell salads." It means to make up stories, exaggerate, or lie.

• Example: Si elle s'est plantée, c'est parce qu'elle n'arrêtait pas de raconter des salades. (If she messed up, it's because she kept making things up.)
• The image: a salad mixes many ingredients into something easy to swallow. A good lie works the same way.

9. Passer un savon

"To pass a soap." It means to scold someone seriously. Parents, bosses, and referees all give out savons.

• Example: L'écolier savait qu'il allait se faire passer un savon pour ses notes. (The schoolboy knew he was going to get an earful about his grades.)
• The origin: in the old days, washing clothes meant soap and hard scrubbing. That is roughly what a good scolding feels like.

10. Avoir un coup de foudre

"To be struck by lightning." It means to fall in love at first sight. It is the most romantic entry on this list, and every French film uses it sooner or later.

• Example: La première fois que je l'ai vu, j'ai eu un coup de foudre. (The first time I saw him, it was love at first sight.)
• The image: lightning strikes fast, without warning, and leaves you changed. So does this.

A few more that natives use constantly:

Collect them the way our students do: 2 per week, spoken out loud the same day. An idiom you have said out loud 3 times is yours forever. An idiom in a notebook is just a souvenir.

Memorizing the list above is the easy part. It takes 10 minutes and one coffee. Making the phrases yours, so they come out mid-conversation without effort, takes a small system:

• Link each idiom to its image. Cockroach = gloom, lightning = love. The picture remembers for you. That is why each expression here comes with one.
• Copy the example sentences whole. Do not build from scratch. Change one word in a sentence you know works.
• Listen for them in real French. They are everywhere once you know them. Count idioms in the films from our classic French movies guide, or in the sketches of the French comedians we recommend.
• Check the real definition when unsure. The Larousse dictionary lists idioms under their key noun (cafard, foudre, savon) with usage notes in French.
• Use one at your next chance. Order a coffee, finish a task, feel tired: there is an idiom for each moment, and the first real use is the one that sticks.

Idioms only count when they come out at the right moment, unplanned. That reflex does not come from lists. It comes from conversations where a teacher gives you the phrase exactly when you need it.

That is how our classes work. The French Transformation program takes complete beginners to conversational French in 6 months with native French teachers from France and Quebec. Classes have a maximum of 16 students, so you speak in every class, idioms included. Learn French in Vancouver has taught 4,500+ students since 2017, in Vancouver and online across Canada.

Already conversational, and want your French to sound native? Private French lessons polish exactly this layer: expressions, register, and the rhythm that makes French sound French. And if you feel nervous about your very first session, here is what to expect in your first French class.