sprag /ˈspræg/
 制輪木


 Sprag n.  Zool. A young salmon. [Prov. Eng.]


 Sprag, n.  A billet of wood; a piece of timber used as a prop.


 Sprag, v. t. [imp. & p. p. Spragged p. pr. & vb. n. Spragging ]
 1. To check the motion of, as a carriage on a steep grade, by putting a sprag between the spokes of the wheel.
 2. To prop or sustain with a sprag.


 Sprag, a. See Sprack, a.

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 sprag
      n 1: a chock or bar wedged under a wheel or between the spokes to
           prevent a vehicle from rolling down an incline
      2: a wooden prop used to support the roof of a mine [syn: pitprop]