以子之矛,攻子之盾

yǐ zǐ zhī máo , gōng zǐ zhī dùn

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定義

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