As he approached, she leaned forward, her low-cut bodice revealing shadowy cleavage.

Blouses must be buttoned/worn so as not to reveal cleavage.

The camera dodged any angles that might reveal cleavage under Keys's jacket.

Almost all of her dresses had the same low necklines, so they revealed more cleavage than I would have liked.

The neckline of her robe had parted, revealing deep, smooth, shadowed cleavage.

However, the term is most commonly applied to a neckline that reveals or emphasizes cleavage.

The neckline plunged down to reveal ample cleavage.

Zoe saw blouses zipped down to reveal cleavage.

The woman had a sleek mane of blond hair, and her low-cut blouse revealed bountiful cleavage.