Definitions
linchpin Tweet Definition of linchpin Like Definition of linchpin on Facebook
noun 
  1. a pin inserted through holes at the end of an axle, so as to secure a wheel
  2. (figurative) a central cohesive source of stability and security; a person or thing that is critical to a system or organisation.
Etymology: From lynspin < lynis (a pin securing a wheel to an axle). Figurative use attested from the mid 20th Century.


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