銘心刻骨 [ㄇㄧㄥˊ ㄒㄧㄣ ㄎㄜˋ ㄍㄨˇ; ming2 xin1 ke4 gu3] engraved in one's heart and carved in one's bones (idiom); to remember a benefactor as long as one lives undying gratitude ◄ ►