以子之矛，攻子之盾
yǐ zǐ zhī máo , gōng zǐ zhī dùn

Translation

  • lit. use sb's spear to attack his shield (idiom, derived from Han Feizi 韓非子|韩非子)
  • turning a weapon against its owner
  • fig. to attack an opponent using his own devices
  • hoist with his own petard
Chinese Tones