What does lines of cleavage mean?

Answer 1

Cleavage occurs naturally between the tissue of the two breasts. We think mostly of well-endowed females as having cleavage, but overweight boys and men can have cleavage too. The "lines of cleavage" are, as a simple description, the line between the clothing or bra and the exposed area of the breast and the "line" or separation between the breasts. So, if a woman wears an ill-fitting bra or one that is too small, the area of cleavage can be pronounced. In smaller bosoms, cleavage is less pronounced or noticeable.