ㄇㄧㄥˊㄒㄧㄣㄌㄡˋㄍㄨˇmíngxīn‑lòugǔ

铭心镂骨
  1. 猶如一般無法忘懷表達他人感激銘心刻骨」、刻骨銘心」、鏤骨銘心」。 父母對子如此銘心鏤骨」。

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