spragn.
英 spræg | 美 spræg
中文n. 止轮垫（防止车子在斜坡往下滑）\nvt. 用止轮木使…停下
止轮垫（防止车子在斜坡往下滑）
vt. 用止轮木使…停下
词根词源
sprag (n.)"prop in a mine," 1841, of unknown origin. Transferred by 1878 to wood blocks, etc., used to brake motor vehicles. As a verb, from 1841. Related: Spragged; spragging.
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