Definition of the real McCoyinformal
- 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.
: of or relating to fixed, permanent, or immovable things (such as lands or tenements)
: not artificial, fraudulent, or illusory : genuine
: occurring or existing in actuality
: a real thing
: very, really
: a former monetary unit and coin of Spain and its possessions
: a former monetary unit and coin of Portugal
: the basic monetary unit of Brazil — see Money Table
: something that is neither imitation nor substitute
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