An idiom is an expression that takes on a figurative meaning when certain words are combined, which is different from the literal definition of the individual words.
An idiom is a multiword expression. Individual components of an idiom can often be inflected in the same way individual words in a phrase can be inflected. This inflection usually follows the same pattern of inflection as the idiom's literal counterpart.
Phrases that are common in everyday language and have figurative meanings