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以子之矛，攻子之盾

yǐ zǐ zhī máo , gōng zǐ zhī dùn

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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

to use

to attack

son

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

shield

spear