以毒攻毒

以毒攻毒 [yǐ dú gōng dú]

1. ■ fight [combat] poison with poison; cure a poisoned patient with poison; counteract one toxin [poison] with another; fight fire with fire; Like cures like.; remove a boil with some poisonous drug; set a thief [rogue] to catch another thief [rogue]; treat the malignant disease with poisonous agents; use poison as an antidote to [for] poison; ovietan:

叫小偷去抓小偷， 这就叫 “以毒攻毒”。 To set a thief to catch a thief, that is what we call “to counteract one toxin with another”.