Cleavage (breasts)

Cleavage is the cleft created by the partial exposure of a woman's breasts, especially when exposed by low-cut clothing. The neckline of a garment that exposes cleavage is known as décolletage (or "décolleté" in current French).

Exposure of the underside of the breast, such as below an extremely short crop top, is known as "neathage" or "Australian cleavage" or "underboob".

"Intermammary sulcus" or "intermammary cleft" are the terms adopted by the International Federation of Associations of Anatomists for the area of cleavage between the breasts not including the breasts.

Popular British zoologist and ethologist Desmond Morris theorized that cleavage is a sexual signal that imitates the image of the cleft between the buttocks.

In South Africa, brassiere marketer Wonderbra sponsors a National Cleavage Day each Spring.