Linchpin - meaning and definition. What is Linchpin
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What (who) is Linchpin - definition

FASTENER USED TO PREVENT A WHEEL OR OTHER PART FROM SLIDING OFF THE AXLE UPON WHICH IT IS RIDING
Lynchpin; Lynch pin; Linch pin
  • Wagon wheel, with forged linchpin
  • A modern linchpin with an integral spring retainer

linchpin         
also lynchpin (linchpins)
If you refer to a person or thing as the linchpin of something, you mean that they are the most important person or thing involved in it.
He's the lynchpin of our team and crucial to my long-term plans.
N-COUNT: with supp, usu N of n
Linchpin         
·noun A pin used to prevent the wheel of a vehicle from sliding off the axletree.
linchpin         
(also lynchpin)
¦ noun
1. a pin through the end of an axle keeping a wheel in position.
2. an indispensable person or thing.
Origin
ME: from OE lynis (in the sense 'linchpin') + pin.

Wikipedia

Linchpin

A linchpin, also spelled linch pin, lynchpin, or lynch pin, is a fastener used to prevent a wheel or other part from sliding off the axle upon which it is riding. The word is first attested in the late fourteenth century and derives from Middle English elements meaning "axletree pin".

Securing implements onto the three-point hitch of a tractor is an example of application. Linchpins may also be used in place of an R-clip for securing hitch pins.

Examples of use of Linchpin
1. Shas is the linchpin of Olmert‘s fragile coalition government.
2. "We‘re only acting." Theatre is the linchpin for Fiennes.
3. It is now a linchpin of the East Asian manufacturing network.
4. Biden‘s closest confidant is his sister Valerie Biden Owens, the linchpin of all his campaigns.
5. The alliance between our two nations is the linchpin for freedom and stability throughout the Pacific.