Linchpin definition

Linchpin

Topics Linchpin Definition

WordNet

(1) Pin inserted through an axletree to hold a wheel on

(2) A central cohesive source of support and stability

"Faith is his anchor"

"The keystone of campaign reform was the ban on soft money"

"He is the linchpin of this firm"

WiktionaryText

From lynspin < lynis (a pin securing a wheel to an axle). Figurative use attested from the mid 20th Century.

a pin inserted through holes at the end of an axle, so as to secure a wheel
a central cohesive source of stability and security; a person or thing that is critical to a system or organisation.