銘心刻骨 míng xīn kè gǔ

DEFINITIONS

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

CHARACTERS

銘 míng inscribe, engrave; unforgettably
心 xīn
HSK 3
heart; mind, intelligence; soul
刻 kè
HSK 3
carve, engrave; quarter hour
骨 gǔ
HSK 5
bone; skeleton; frame, framework