A "deep neckline" refers to a low-cut or plunging neckline on a garment, typically a top or dress, where the opening in the front reveals a significant portion of the wearer's chest or cleavage. Full definition
Although this dress is an outstanding piece by itself (with a sexy deep neckline on the back), I decided to style it adding a black under skirt. (bonjourchiara.com)
Vine color lace sheer side slit prom dress is designed with deep neckline e with scalloped edge half sleeves floor touching outfit. (designersoutfits.com)
Knitted Solid colour Deep neckline Long sleeves No appliqués Medium - weight knitted No pockets. (polyvore.com)