noun
also de·col·le·tage (ˌ)dā|kälə|täzh, (ˌ)de|-, -kȯl-, -kōl-, -tȧzh, | ̷ ̷ˌ ̷ ̷ ̷ ̷| ̷ ̷; deklə|t-
( -s )
Etymology: French, action of cutting a low neckline, wearing of a low-necked dress, from décolleter + -age
1. : the low-cut neckline of a woman's dress
the square décolletage … finished with a tiny border of oak leaves and acorns in gold — New York Times
2. : a décolleté dress
a spectacular succession of off-the-shoulder décolletages — Newsweek