名詞 pawl:

1. a hinged catch that fits into a notch of a ratchet to move a wheel forward or prevent it from moving backward
   同義詞：detent, click, dog

pawl

n.（名詞）
A hinged or pivoted device adapted to fit into a notch of a ratchet wheel to impart forward motion or prevent backward motion.
掣爪，棘爪：一種樞軸或轉(zhuǎn)軸器械，能與齒輪缺口或齒間吻合來前進或防止后移

來源：
Probably from Dutch pal
可能源自 荷蘭語 pal
from Latin p3lus [stake] * see pag-
源自 拉丁語 p3lus [樁，支柱] *參見 pag-