a 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.
Mining . a short timber for propping up loose walls or spacing two sets.
Verb (used with object)
to prop, support, or immobilize (a vehicle) by means of a sprag.
Verb (used without object)
to slow a vehicle by means of a sprag or, sometimes, by bracing the feet against the ground.
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