DICT.TW Dictionary Taiwan

 以其人之道，還治其人之身 [ㄧˇ ㄑㄧˊ ㄖㄣˊ ㄓ ㄉㄠˋ , ㄏㄨㄢˊ ㄓˋ ㄑㄧˊ ㄖㄣˊ ㄓ ㄕㄣ; yi3 qi2 ren2 zhi1 dao4 , huan2 zhi4 qi2 ren2 zhi1 shen1]
 to use an opponent's own methods to obtain retribution (idiom, from Song dynasty neo-Confucianist Zhu Xi 朱熹); to get revenge by playing sb back at his own game
 to give sb a taste of his own medicine
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