décolletage
noun /ˌdeɪkɒlˈtɑːʒ/
/ˌdeɪkɑːləˈtɑːʒ/
(also décolleté
(from French) /deɪˈkɒlteɪ/
/ˌdeɪkɑːlˈteɪ/
)- the top edge of a woman’s dress, etc. that is designed to be very low in order to show her shoulders and the top part of her breasts
（女装的）低胸露肩领