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

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Child Words of 以子之矛，攻子之盾

(possessive particle, literary equivalent of 的[de])

to use

son

to attack

shield

spear