Definition of idiom noun from the Oxford Advanced American Dictionary

     

    idiom

     noun
    noun
    NAmE//ˈɪdiəm//
     
     
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  1. 1[countable] a group of words whose meaning is different from the meanings of the individual words “Let the cat out of the bag” is an idiom meaning to tell a secret by mistake. Thesauruswordterm phrase expression idiomThese are all words for a unit of language used to express something.word a single unit of language that means something and can be spoken or written:Do not write more than 200 words. He uses a lot of long words.term (somewhat formal) a word or phrase used as the name of something, especially one connected with a particular type of language:technical/legal/scientific terms “Old man” is a slang term for “father.”phrase a group of words that have a particular meaning when used together:Who coined the phrase “desktop publishing” (= used it for the first time)? In grammar, a phrase is a group of words without a finite verb, especially one that forms part of a sentence: “the green car” and “on Friday morning” are phrases.expression a word or phrase:He tends to use lots of new expressions that I've never heard before.idiom a group of words whose meaning is different from the meanings of the individual words:“To let the cat out of the bag” is an idiom meaning to tell a secret by mistake.Patterns a(n) word/term/expression for something a new word/term/phrase/expression a technical/colloquial/slang word/term/phrase/expression an idiomatic phrase/expression to use a(n) word/term/phrase/expression/idiom to coin a(n) word/term/phrase/expression a(n) word/term/phrase/expression/idiom means something
  2. 2[uncountable, countable] (formal) the kind of language and grammar used by particular people at a particular time or place
  3. 3[uncountable, countable] (formal) the style of writing, music, art, etc. that is typical of a particular person, group, period, or place the classical/contemporary/popular idiom
See the Oxford Advanced Learner's Dictionary entry: idiom