adj
(a) (of a woman) having the breasts and upper part of the body bare （指女子）上身裸露的, 无上装的
*a topless waitress 无上装女服务员.
(b) (of a woman's garment) exposing the breasts （指女装）露乳房的
*a topless dress 露乳房的连衣裙. adv with the breasts bare 露着乳房
*sunbathe topless 露着乳房作日光浴.

adj
if a woman is topless, she is not wearing any clothes on the upper part of her body, so that her breasts are not covered
　topless sunbathing
topless bar/show
(=one in which the women serving or performing are topless)