pole or bar hinged to the rear axle of a cart or the like in such a way that it can brace the vehicle against a road to prevent it from rolling downhill
short timber for propping up loose walls or spacing two sets
to prop, support, or immobilize (a vehicle) by means of a sprag
to slow a vehicle by means of a sprag or, sometimes, by bracing the feet against the ground
to prop (to hold up) [v SPRAGGED, SPRAGGING, SPRAGS]
a device used to prevent a vehicle from rolling backward [n SPRAGS]