Lynchpin meaning

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