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

(figuratively) A central cohesive source of stability and security; a person or thing that is critical to a system or organisation.

Wiktionary

Other Word Forms of Lynchpin

Noun

Singular:
lynchpin
Plural:
lynchpins

Origin 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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