idiom - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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idiom

noun uk   us   /ˈɪd.i.əm/
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.
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(Definition of idiom from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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