sprag

Noun
  1. A chock or bar wedged under a wheel or between the spokes to prevent a vehicle from rolling down an incline (synset 104294589)
    is a type of: chock, wedge - a block of wood used to prevent the sliding or rolling of a heavy object
  2. A wooden prop used to support the roof of a mine (synset 103957966)
    is a type of: prop - a support placed beneath or against something to keep it from shaking or falling
    same as: pitprop

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