以子之矛，攻子之盾
yǐzǐzhīmáo,gōngzǐzhīdùn
ㄧˇ ㄗˇ ㄓ ㄇㄠˊ , ㄍㄨㄥ ㄗˇ ㄓ ㄉㄨㄣˋ
- 1lit. 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
- 2fig. to attack an opponent using his own devices
- 3hoist with his own petard