A cut in a woman's top that shows parts of the top of her breasts. It doesn't matter the shape or the size (of the window or the breasts), as long as the window is completely enclosed. It also doesn't matter about the rest of the outfit, as this can be on a bathing suit, a sweater, a Leotard of Power, a Mini-Dress of Power or a grand Pimped-Out Dress. Obviously a form of Fan Service, and likely Author Appeal. Compare Most Common Superpower, Absolute Cleavage, Impossibly Low Neckline, Chainmail Bikini, Naked in Mink, Bare Your Midriff. Examples of Cleavage Window include: