halterneck
noun [ C ] UK uk/ˈhɒl.tə.nek/ us/ˈhɑːl.t̬ɚ.nek/ (US halter, halter top)
（女子的）露背装
a piece of women's clothing that is held in position by a strap that goes behind the neck so that the upper back and shoulders are not covered
a halterneck dress/swimsuit 露背装／泳装