n. One of two soft protuberant bodies adhering to the thorax in women, in which the milk is secreted for the nourishment of infants; the mammary gland and associated structures.n. The outer part of the thorax, or the external part of the body between the neck and the belly, in man and beasts.n. In entomology, the lower or sternal surface of the thorax.n. Figuratively, the seat of the affections and emotions; the repository of consciousness, designs, and secrets; the affections; the heart.n. The mind; the secret thoughts.n. In music, the chest; capacity for singing.n. Anything resembling the breast in position, either as being in front, like the human breast, or below, like the breast in the lower animals.n. That part of certain machines against which the breast of the operator pushes, as in the breast-drill, breast-plow, etc.n. A line on which persons or things are ranged abreast, or side by side.n. A bush for a small shaft or spindle.To oppose with the breast; act with the breast upon; bear the breast against; hence, to meet in front boldly or openly; stem.To practise breasting, as for deer. See breasting, 3.n.