V-neck
US /ˈviː.nek/
UK /ˈviː.nek/

1.
a type of neckline on a garment that forms a V-shape at the front
:
•
She wore a stylish V-neck sweater.
•
The dress had a deep V-neck.
1.
having a V-shaped neckline
:
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He prefers to wear V-neck shirts.
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She bought a new V-neck dress for the party.