Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: Scottish family name

McCoy

 noun
     
McCoy

the real McCoy

informal something that is real and is not a copy, especially something valuable:
In the movie, the two thieves try to discover whether the banknotes are fakes or the real McCoy.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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