smoking gunnoun [ C usually singular ]uk /ˌsməʊ.kɪŋ ˈɡʌn/ us /ˌsmoʊ.kɪŋ ˈɡʌn/
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(Definition of “smoking gun” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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something that a copy can be based on because it is an extremely good example of its type