A dialectal or vulgar form of burst.n. A dialectal or vulgar form of burst.n. Specifically, a spree: as, to go on a bust.n. The chest, thorax, or breast; the trunk of the human body above the waist.n. In sculpture, the figure of a person in relief, showing only the head, shoulders, and breast.To put a tar-mark upon (sheep).n. A tar-mark on sheep.To break to the saddle, as an intractable bronco.