Source : Webster's Revised Unabridged Dictionary (1913)

Low-necked \Low"-necked`\, a.
   Cut low in the neck; decollete; -- said of a woman's dress.

Source : WordNet®

low-necked
     adj : (of a garment) having a low-cut neckline; "a low neckline"
           [syn: {decollete}, {low-cut}]