sprag

English Thesaurus

1. a wooden prop used to support the roof of a mine (noun.artifact)

hypernym	:	prop,
definition	:	a support placed beneath or against something to keep it from shaking or falling (noun.artifact)

2. a chock or bar wedged under a wheel or between the spokes to prevent a vehicle from rolling down an incline (noun.artifact)

hypernym	:	chock, wedge,
definition	:	a block of wood used to prevent the sliding or rolling of a heavy object (noun.artifact)