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Definition of expression for Students. 1  1 : the act or process of making known especially in words. 2  2 : a meaningful word or saying Grandpa uses old-fashioned expressions. 3  3 : the look on someone's face She had a pleased expression. 4  4 : a way of speaking, singing, or playing that shows mood or feeling She read her lines with expression.
Noun. 1. idiomatic expression-an expression whose meanings cannot be inferred from the meanings of the words that make it up. phrasal idiom, set phrase, phrase, idiom.oun. 1. idiomatic expression-an expression whose meanings cannot be inferred from the meanings of the words that make it up. phrasal idiom, set phrase, phrase, idiom.