To be engraved on one's heart and bones; unforgettable and deeply cherished.
铭刻在心灵深处。形容记忆深刻，永远不忘。
唐·李白《上安州李长史书》深荷王公之德，铭刻心骨。”
The teacher's kindness was engraved on my heart like an indelible mark.
Learn the next connected idiom: 刻骨铭心 (kè gǔ míng xīn) → 心有余悸 (xīn yǒu yú jì)
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