Décolletage /(dā`kō̇`l'*tȧzh)/

Dé·col·le·tage

Décolletage

n.
  1. The upper border or part of a low-cut (i.e., décolleté) dress. (Costume)
  2. The exposed upper parts of the breasts of a woman wearing a low-cut dress; as, transfixed by her stunning decolletage.