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English definition of “idiom”

idiom

noun uk   /ˈɪd.i.əm/ us  
B2 [C] a group of words in a fixed order that have a particular meaning that is different from the meanings of each word on its own: To "have bitten off more than you can chew" is an idiom that means you have tried to do something which is too difficult for you. [C or U] formal the style of expression in writing, speech, or music that is typical of a particular period, person, or group: Both operas are very much in the modern idiom.
(Definition of idiom from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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