Definition of McCoy noun from the Oxford Advanced Learner's Dictionary

 

McCoy

 noun
noun
BrE BrE//məˈkɔɪ//
 
; NAmE NAmE//məˈkɔɪ//
 
 
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Idioms
the real McCoy
 
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(informal) something that is genuine and that has value, not a copy It's an American flying jacket, the real McCoy.
See the Oxford Advanced American Dictionary entry: McCoy