be hoist with one’s own petard

【字面理解】被自己的炸药吊起

【英文解析】to be injured by the device that someone intended to use to injure others

【中文解析】陷入自设的圈套，搬起石头砸自己的脚;自食 其果

【典型例句】① He was hoist with his own petard when he was fined for accidentally breaking the rule he himself introduced.他无意中违反了他自己提出的规则，结果 要被罚钱，可谓作法自毙了。

② The criminal was hoist with his own petard when he tried to kill his wife，because he accidentally drank the poison that he intended to give to her.那个罪犯想要杀害自己的妻子，结果却误饮了本要毒害妻子.的毒药，坤迄是自食其果。 -

【注释】源于莎士比亚的戏剧《哈婢雷特》(Hamkt)： For, tis the sport to have the engineer hoist with his own petard.(开炮的要是给炮轰了，倒是一件好玩的事。) 变体：be hoist by/on one’s own petard