1 [sprag]
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), spragged, spragging.
to prop, support, or immobilize (a vehicle) by means of a sprag.
verb (used without object), spragged, spragging.
to slow a vehicle by means of a sprag or, sometimes, by bracing the feet against the ground.

1835–45; special use of dial. sprag twig (Old English spræcg shoot, slip); akin to sprig

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World English Dictionary
sprag (spræɡ)
1.  a chock or steel bar used to prevent a vehicle from running backwards on an incline
2.  a support or post used in mining
3.  (NZ) mining a steel bar inserted into the wheels of a box to act as a brake
[C19: of uncertain origin]

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