以毒攻毒
combat poison with poison ;
Like cures like. ;
Fire with fire;
Set a thief to catch a thief. ;
take a hair of the dog that bit you
To set a thief to catch a thief, that is what we call “to counteract one toxin with another”. 叫小偷去抓小偷, 这就叫 “以毒攻毒”。