An idiom is a common expression that means something different to the literal meaning of the words. This page has lots of examples of idioms and an interactive exercise.
An idiom is a phrase or expression that typically presents a figurative, non-literal meaning attached to the phrase but some phrases become figurative idioms while retaining the literal meaning of the phrase. Categorized as formulaic language, an idioms figurative meaning is different from the literal meaning.
english idioms, proverbs, and expressions are an important part of everyday english.
idiom definition, an expression whose meaning is not predictable from the usual meanings of its constituent elements, as kick the bucket or hang ones head, or from the general grammatical rules of a language, as the table round for the round table, and that is not a constituent of a larger expression of like characteristics.