set a thief to catch a thief
动词 v.
英文释义
动词 v.
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To employ an unscrupulous person in order to catch another unscrupulous person.
— The morality of setting a thief to catch a thief passes muster in the English force; but they do these things better in America. Pinkerton's system for the detective police in America is vastly superior to the British system.
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数据来源: Wiktionary