sprag /ˈspɹæɡ/verb 2noun 1forms 3 verb2 •To prop or sustain with a sprag. •To check the motion of, as a carriage on a steep slope, by putting a sprag between the spokes of the wheel.Accidents happen to the driver while running alongside his trip, spragging wheels or applying brakes — 1911 noun1 •A billet of wood; a piece of timber, a similar solid object or constructed unit used as a prop. formsspragged · spragging · sprags