"High neckline" refers to a type of clothing or garment that covers the area around the neck fully, usually reaching close to the collarbone, providing coverage and modesty. Full definition
It's a classic little black dress updated with high neckline and sheer mesh detailing. (creativefashionglee.com)
The long sleeves and high neckline of this particular design give the outfit a classic spin that is both flattering and unique, without appearing too over-the-top. (theheartsdlite.com)
The sheer high neckline is the most special part of this dress. (weddingdresstrend.com)