Lynchpin Definition
linchpin
noun
Webster's New World
A pin inserted through holes at the end of an axle, so as to secure a wheel.
Wiktionary
Other Word Forms of Lynchpin
Noun
Singular:
lynchpin
Plural:
lynchpinsOrigin of Lynchpin
From Middle English lynspin, from Old English lynis (a pin securing a wheel to an axle). Figurative use attested from the mid 20th Century.
From Wiktionary
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