noun A billet of wood, piece of timber, or similar solid object or constructed unit that is used as a prop. A piece of wood used to stop, check, or prevent the motion of a wagon or mine car, whether by propping it in place or acting as a brake against its wheels or axles.
noun A piece of wood used to stop, check, or prevent the motion of a wagon or mine car, whether by propping it in place or acting as a brake against its wheels or axles.
verb To check the motion of, as a carriage on a steep slope, by putting a sprag between the spokes of the wheel.