Se dit de quelqu'un qui croit tout savoir.
Said about someone who thinks they know everything.
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See how the word “c'est un je-sais-tout” is used in sentences
C'est un je-sais-tout et il n'écoute jamais. — He's a know-it-all and never listens.
Ne discute pas avec lui, c'est un je-sais-tout. — Don't argue with him, he's a know-it-all.
Elle le trouve je-sais-tout. — She finds him a know-it-all.
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