SPRAG
\spɹˈaɡ], \spɹˈaɡ], \s_p_ɹ_ˈa_ɡ]\
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By DataStellar Co., Ltd
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To check the motion of, as a carriage on a steep grade, by putting a sprag between the spokes of the wheel.
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To prop or sustain with a sprag.
By Oddity Software
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A billet of wood: specifically, in mining, a diagonal prop or stay for preventing the roof of a mine from sinking in. Edin. Rev.
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To prop by a sprag: also to stop, as a carriage, on a steep gradient, by putting a sprag in the spokes of the wheel.
By Daniel Lyons
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