常见于习语the real McCoy，真货，真品。词源不详，通常认为是来自苏格兰语the real Mackay，来自苏格兰Glasgow的威干忌公司A.and M.Mackay，据说是来自打假广告词It’s the real McCoy.该姓氏字面意思为Son of Kay.
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习语 n. the real McCoy (informal) 真货；真品 something that is genuine and that has value, not a copy It's an American flying jacket, the real McCoy. 这是件真正的美国飞行员夹克。
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