linchpin
/ˈlɪnt͡ʃˌpɪn/ noun, verb
Forms linchpins linchpinning linchpinned linch-pin lynchpin lynch-pin link-pin lin-pin
- noun A pin inserted through holes at the end of an axle or shaft, so as to secure a wheel or shaft-mounted device.
- noun (figuratively) A central cohesive source of stability and security; a person or thing that is critical to a system or organisation.
- verb (ambitransitive) To adopt as, or serve as, a central cohesive source of stability and security.
Synonyms
Etymology
From Middle English lynspin, compound of lins (“axletree”) and pin, from Old English lynis (“lynchpin”), from Proto-West Germanic *lunis, from Proto-Germanic *lunaz – compare German Lünse and Dutch luns – from Proto-Indo-European. Possible further cognates are Welsh olwyn (“wheel”), Old Armenian ողն (ołn, “back; spine, backbone”) and Sanskrit आणि (āṇí, “lynchpin”). Figurative use attested from the mid-20th century.
Webster’s 1913
Etymology [AS. lynis the axletree; akin to D. luns linchpin, OS. lunisa, LG. lunse, G. lünse, OHG. lun peg, bolt.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “linchpin”, CC BY-SA 4.0. Details