make a law only to fall foul of it oneself;be caught by one's own laws [device];be hoist with [by] one's own petard;be injured [caught] by what one intended as a snare for others ;

It was indeed a clever plan to entrap his opponent, but in the end he was hoist by his own petard.
设圈套陷害他的对手固然是个妙计, 可是到头来却是作法自毙.
来源:《简明英汉词典》
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