デコルテ

1. 1décolleté ; décolletage ; the part of a woman's chest and back exposed by a low neckline Translated by Jiyomi
2. 2robe décolletée ; low-cut dress Translated by Jiyomi
3. 3low-cut (neckline style) ; décolleté Translated by Jiyomi

JMdict entry 1082800. Source and licence.