breast

The breast is the front of the chest — and, on a woman, one of the two milk glands. The word does both jobs.

Cooking uses the first sense, so a chicken breast is the white meat at the front. Medicine uses the second, and breast cancer, breastfeeding and a breast screening are all standard terms. Swimming has breaststroke. There is a formal verb meaning to face something head on, as in breasting the hill, and a runner breasts the tape at the finish.