used to describe someone, usually a woman, wearing nothing on the upper part of the body, or something connected with this way of dressing

topless dancers/bars/sunbathing 裸露上身的舞女／女招待裸露上身的酒吧／袒胸日光浴

Many women now go topless on the beach. 如今许多女人都在海滩上袒露上身。