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

lynchpin         
lynchpin         
¦ noun variant spelling of linchpin.
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 lynchpin
1. The theme is likely to be the lynchpin of his campaign.
2. He was the lynchpin of the Syrian security apparatus for more than two decades."
3. The backing Syria and Iran give to the Lebanese Shi‘ite movement is the lynchpin of their alliance.
4. Britain‘s family doctors, admired around the world, are thought of as the lynchpin of our National Health Service.
5. Tokyo argues that ignoring its views could sour an alliance seen as a lynchpin for Asian security.