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Related to McCoy: The Real McCoy
The authentic thing or quality; something that is not an imitation or substitute: This gem is the real McCoy.
[Alteration of earlier McKay, probably from Scots, good unadulterated whiskey.]
slang the genuine person or thing (esp in the phrase the real McCoy)
[C20: perhaps after Kid McCoy, professional name of Norman Selby (1873–1940), American boxer, who was called "the real McCoy'"to distinguish him from another boxer of that name]
(Biography) Tony, full name Anthony Peter McCoy. born 1974, Northern Irish national hunt jockey: champion jockey every season since 1995/96
the genuine thing or person as promised, stated, or implied (usu. in the phrase the real McCoy).
[1880–85; also Mackay, McKie, the clear McCoy (of liquor); of uncertain orig.]