- a pin inserted through holes at the end of an axle, so as to secure a wheel
- (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.
- German: Achsnagel , Lí¼nse
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