noun
a device used to prevent a vehicle from rolling or moving
verb
to stop or prevent a vehicle from rolling or moving using a sprag
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The mechanic used a sprag to prevent the wheel from turning during maintenance.
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I found a sprag in the garage and used it to prop open the door.
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Hey, can you pass me that sprag over there?
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His confidence acted as a sprag, keeping him steady in the face of adversity.