anchor, mainstay, keystone, backbone, linchpin, lynchpin(noun)
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"
pin inserted through an axletree to hold a wheel on
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.
Origin: lynspin, compound of lins 'axletree' and pin, from lynis 'linchpin', from *luniso (compare Lünse), from (compare olwyn 'wheel', ołn 'shoulder', āṇís). Figurative use attested from the mid-20th century.
a pin used to prevent the wheel of a vehicle from sliding off the axletree
Origin: [AS. lynis the axletree; akin to D. luns linchpin, OS. lunisa, LG. lunse, G. lnse, OHG. lun peg, bolt.]
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 14th 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. The word "linchpin" is also used figuratively to mean "something [or someone] that holds the various elements of a complicated structure together."
Chambers 20th Century Dictionary
linsh′pin, n. a pin used to keep the wheel of a carriage on the axle-tree. [Properly linspin, 'axle-pin'—obs. linse, axle, and pin.]
The numerical value of linchpin in Chaldean Numerology is: 4
The numerical value of linchpin in Pythagorean Numerology is: 4
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