以子之矛，攻子之盾
yi3 zi3 zhi1 mao2 , gong1 zi3 zhi1 dun4
以子之矛，攻子之盾
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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