To use someone's own arguments, methods, or resources to counter or refute them; to hoist someone by their own petard.
在辩论中，小明巧妙地以对方提出的数据为依据，反驳了对方的观点，真是以子之矛，攻子之盾。
During the debate, Xiao Ming cleverly used the data presented by his opponent to refute their viewpoint, truly turning their own arguments against them.
Era:
Ancient
Frequency:
Synonym:
Story:
During the Warring States period, the great thinker Han Feizi once told a story about a man who sold both spears and shields.
He would boast to people that his spear was the sharpest in the world, capable of piercing anything. A moment later, he would promote his shield, claiming it was the toughest in the world, impenetrable by any weapon.
Someone in the crowd then asked him, 'What if you use your spear to strike your own shield?'
The man was left speechless and had to flee in embarrassment.
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