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English definition of “the real McCoy”

the real McCoy

noun [S] uk   /ˌrɪəl məˈkɔɪ/ us    /ˌriː.əl-/
the original or best example of something: The caviar was the real McCoy too - not the stuff we buy in the supermarket at home.Reality and truth
(Definition of the real McCoy from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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