DICT.TW Dictionary Taiwan

 以眼還眼，以牙還牙 [ㄧˇ ㄧㄢˇ ㄏㄨㄢˊ ㄧㄢˇ , ㄧˇ ㄧㄚˊ ㄏㄨㄢˊ ㄧㄚˊ; yi3 yan3 huan2 yan3 , yi3 ya2 huan2 ya2]
 an eye for an eye, a tooth for a tooth (idiom)
 fig. to use the enemy's methods against him
 to give sb a taste of his own medicine
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