1. a. Either of two milk-secreting, glandular organs on the chest of a woman; the human mammary gland. b. A corresponding organ in other mammals. c. A corresponding rudimentary gland in the male.

2. a. The superior ventral surface of the human body, extending from the neck to the abdomen. b. A corresponding part in other animals.

3. The part of a garment that covers the chest.

4. The seat of affection and emotion: "Griefs of mine own lie heavy in my breast" (Shakespeare).

5. A source of nourishment.

6. Something likened to the human breast: the breast of a hill.

7. The face of a mine or tunnel.

1. To rise over; climb: "He breasted a rise and looked down. He was at the head of a small valley" (Ken Follett).

2. To encounter or advance against resolutely; confront boldly.

3. To push against with or as if with the breast.