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以毒攻毒

Source : CEDICT

to cure ills with poison (idiom, refers to technique of traditional Chinese medicine); to fight evil with evil/set a thief to catch a thief/to fight fire with fire

Source : CEDICT

to cure ills with poison (idiom, refers to technique of traditional Chinese medicine); to fight evil with evil/set a thief to catch a thief/to fight fire with fire