以毒攻毒yīngwénjièshì:
  • n.  fight fire with fire
  • n.  Take a hair of the dog that bit you
  • n.  Set a thief to catch a thief.
  • n.  Take a bit of the dog that bit you

(fēizhùcèchéngyuánměiyèzànxiàn 4 lì)