breast: the milk-giving breast of a woman or a nursing animal
This is the ordinary Hebrew word for the breast, and it is the same word whether the breast feeds a baby, draws a lover, or hangs shriveled under a curse. The Bible never speaks of it clinically; it is always tied to life given or, when it fails, life withheld.
Its senses are shades of one picture rather than separate meanings. As the source of milk it stands for nurture and the very beginning of life, from the blessing of "breasts and womb" to the infant safe at its mother's breast. In love poetry it becomes the object of delight and the sign of a woman grown to maturity. Turned toward judgment, the prophets use that same body to shame a people who have been unfaithful. And once, in a scene of mourning, it is simply the chest that grieving people beat.
Hebrew has a second, blunter word for the same body part (דַּד), and the two even stand side by side in one of Ezekiel's harshest passages. What holds all of this word's uses together is not a range of meanings but a range of human life gathered around a single organ: hunger and comfort, desire and shame, birth and loss.