Also known as: 片乳, 单乳露出
When one breast is exposed while the other remains covered or clothed. See Breasts Out for when both breasts are exposed.
If the breast is only partially exposed, the entire nipple and areola should be visible.
This tag most often accompanies Open Shirt, Wardrobe Malfunction, Shirt Pull, Bra Pull, or similar tags, but it is not a necessity.