the real McCoy

noun
variants: also US the McCoy

Definition of the real McCoy 

informal

: something or someone that is real or genuine : something or someone that is not a copy or imitation Is that a fake gun, or is it the real McCoy? These diamonds look like the real McCoy, but they could be fake. To help her play the role of a lawyer, the actress studied with the real McCoy.

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not any or not one

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