銘心刻骨

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

lit. etched into one's heart and bones (idiom) / fig. etched in one's memory; remembered with gratitude as long as one lives

to engrave / inscribed motto

heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]

quarter (hour) / moment / to carve / to engrave / to cut / oppressive / classifier for short time intervals

ingrained / entrenched / deep-rooted

bone