decolletage
/ˌdeɪkɑːlˈtɑːʒ/
noun
- A low neckline on a woman's dress or top that exposes the shoulders and upper chest.
- She wore a stunning gown with a dramatic decolletage to the awards ceremony.
- For the formal dinner, she chose a dress with a modest decolletage.
- The designer's new collection features elegant decolletage on many of the evening dresses.