An idiom (un idiome) is a group of words, an expression not taken literally.

It is an expression whose ultimate meaning cannot be derived from the sum of the meanings of its elements.

In other words, an idiom is a group of words established by usage. One cannot deduce an idiom's meaning from those of the individual words (I just repeated myself, but that's okay)

pleuvoir des cordes (raining cats and dogs)--> Raining heavily... Seriously?

Se mettre le doigt dans l'oeil (to be entirely mistaken) 

 

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Here are a few French idioms for your convenience.

• coûter les yeux de la tête. / To cost an arm and a leg.
• coup de foudre. / To Love at first sight.
• faire la grasse matinée / To sleep in.
• passer du coq à l'âne / To move from one subject to another.
• la moutarde lui monte au nez / He is starting to get hungry.

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