骨ほねに刻きざむ

expression, godan verb (-mu)

engrave in one's heart; never forget

Idiomatic expression meaning to remember something deeply and permanently, as if carved into one's bones. Often used for lessons, gratitude, or painful experiences.

• この教きょう訓くんを骨ほねに刻きざんでおきなさい。

  Engrave this lesson in your heart.

• 彼かれの親しん切せつは骨ほねに刻きざむほど感かん謝しゃしている。

  I am so grateful for his kindness that I will never forget it.