铭心刻骨

engraved in one's heart and carved in one's bones (idiom); to remember a benefactor as long as one lives; undying gratitude

lit. carved in bones and engraved in the heart (idiom); fig. etched in one's memory

etched in one's bones and heart (idiom); ever-present memory (esp. resentment)

etched in one's bones and heart (idiom); ever-present memory (esp. resentment)

hard to forget even after one's teeth fall out (idiom); to remember a benefactor as long as one lives; undying gratitude

lit. will not be forgotten even after one's teeth fall out; to remember as long as one lives