noun
Refers to the edge or opening of a garment around the neck, such as on a dress, shirt, or blouse.
このワンピースは襟ぐりが広い。
This dress has a wide neckline.
襟ぐりのデザインがおしゃれだ。
The neckline design is stylish.
Compound of 襟 (eri, 'collar') and ぐり (guri, from 刳り, meaning 'cutting out' or 'hollowing'). The ぐり part refers to the cut-out shape of the neck opening.