銘心鏤骨 míng xīn lòu 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
鏤 lòu carve, inlay, engrave, tattoo
骨 gǔ
HSK 5
bone; skeleton; frame, framework