以子之矛，攻子之盾

yǐ zǐ zhī máo , gōng zǐ zhī dùn

Definitions

1. 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
2. fig. to attack an opponent using his own devices
3. hoist with his own petard

Child Words of 以子之矛，攻子之盾

• 之 zhī: (possessive particle, literary equivalent of 的[de])
• 以 yǐ: to use
• 子 zǐ: son
• 攻 gōng: to attack
• 盾 dùn: shield
• 矛 máo: spear