開心 kāixīn HSK2 happy Origin Definitions Defs Strokes Stroke Words Sentences Sents kāixīn happy · to make fun of 开 開 kāi verbparticle to open to open; to unfold; to unseal; (of flowers) to bloom; to carve or cut open心 xīn noun feelings mood; emotion; state of mindkāixīn to be sincere · open-heart surgery 开 開 kāi verbparticle to open to open; to unfold; to unseal; (of flowers) to bloom; to carve or cut open心 xīn noun heart the physical organ that pumps blood; refers to the chest area where the heart is locatedkāixīn to enlighten 开 開 kāi verbparticle to open to open; to unfold; to unseal; (of flowers) to bloom; to carve or cut open心 xīn noun mind thought; intellect; the organ of thinking