铭记于心 míngjìyúxīn to engrave on one's heart Origin Definitions Defs Strokes Stroke Words Sentences Sents 铭记 銘記 míngjì verb to engrave in one's memory to engrave on one's mind; to remember firmly; to always bear in mind于 於 yú preposition in Indicates a location, scope, or time; equivalent to 在 zài心 xīn noun mind thought; intellect; the organ of thinking