銘心鏤骨 [ㄇㄧㄥˊ ㄒㄧㄣ ㄌㄡˋ ㄍㄨˇ; ming2 xin1 lou4 gu3] engraved in one's heart and carved in one's bones (idiom); to remember a benefactor as long as one lives undying gratitude ◄ ►