Breast  —n. 1 a either of two milk-secreting organs on a woman's chest. B corresponding part of a man's body. 2 a chest. B corresponding part of an animal. 3 part of a garment that covers the breast. 4 breast as a source of nourishment or emotion. —v. 1 contend with. 2 reach the top of (a hill).  make a clean breast of confess fully. [old english]