In bridal fashion, what neckline plunges into a deep V between the breasts?

In bridal fashion, a neckline that plunges into a deep V between the breasts is a plunging neckline.

A plunging neckline is defined by its unusually low central point, often extending well below the collarbone. In wedding dresses, designers commonly reinforce the shape with mesh, adhesive support, boning, or carefully placed embroidery so the gown retains structure while appearing daring.

The style became especially visible in late twentieth-century red-carpet fashion and later entered mainstream bridal collections. It can be cut into an otherwise traditional ball gown, mermaid gown, or simple sheath, so the neckline describes the upper edge rather than the whole silhouette.

A plunging neckline is not the same as an ordinary V-neck. A V-neck may be modest and shallow, whereas “plunging” specifically signals a much deeper opening. Coverage and construction vary by designer and by dress.