décolletage
noun/ˌdeɪkɒlˈtɑːʒ/
/ˌdeɪkɑːləˈtɑːʒ/
(also décolleté
(from French)/deɪˈkɒlteɪ/
/ˌdeɪkɑːlˈteɪ/
)- the top edge of a dress, etc. that is designed to be very low in order to show the shoulders and the top part of the breasts
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décolletage