N-COUNT (连衣裙、女衬衫等的)领口，开领 The neckline of a dress, blouse, or other piece of clothing is the edge that goes around your neck, especially the front part of it. (连衣裙、女衬衫等的)领口，开领
...a short brown dress with a plunging neckline.
棕色深开领短裙
...a dress with pale pink roses around the neckline.