Boat Neckline This wide neckline mimics the shape of a canoe. It is also known as a Slash-Neck..
Boat Neckline is also called Bateau Neckline,, Bateau is French for "boat."
Other /More definition:
Boat Neckline refers to a type of neckline which is cut in shallow curve from shoulder to shoulder.
Boat Neckline is also called Bateau Neckline