Refers to a bruise caused by a blunt impact, as opposed to a cut or internal injury.
I fell and got a bruise on my knee.
Cooling is effective for bruises.
Standard kanji spelling.
Variant spelling, less common.
Compound of 打ち (uchi, 'striking', continuative form of 打つ) and 身 (mi, 'body'). Literally 'struck body'.