(1):

(n.) to support and steady a stone.

(2):

(n.) Originally, a solid exterior angle, as of a building; now, commonly, one of the selected pieces of material by which the corner is marked.

(3):

(n.) A wedgelike piece of stone, wood metal, or other material, used for various purposes

(4):

(n.) To support the breech of a cannon.

(5):

(n.) To prevent casks from rolling.

(6):

(n.) To wedge or lock up a form within a chase.