sprag

noun

1. a chock or bar wedged under a wheel or between the spokes to prevent a vehicle from rolling down an incline

Definition categories: man–made, chock, wedge

2. a wooden prop used to support the roof of a mine

Definition categories: man–made, prop

verb

1. (transitive) To check the motion of, as a carriage on a steep slope, by putting a sprag between the spokes of the wheel.

2. (transitive) To prop or sustain with a sprag.