linchpin means A pin inserted through holes at the end of an axle or shaft, so as to secure a wheel or shaft-mounted device. Lexicurio rates it Rare gem — a strength score of 76 out of 100.
linchpin is pronounced /ˈlɪnt͡ʃˌpɪn/.
Why “linchpin” is a great word
A person or thing essential to the coherence, stability, or success of a system. From Middle English *lynspin*, a compound of *lyns* (axletree, from Old English *lynis*, from Proto-Germanic *lunaz*) and *pin*; its figurative use is attested from the mid-20th century. Unlike a "keystone," the singular, crowning piece of an arch, or a "mainstay," a durable source of long-term support, the linchpin is a humble, embedded necessity whose absence causes not a slow decline but an immediate, catastrophic halt. It is the overlooked bracket that keeps the shelf from shearing, the quiet administrator whose daily rituals hold the office together, the single treaty clause upon which all others depend—a testament to how the most critical elements are often the least celebrated, until their failure unleashes a sudden, catastrophic unspooling of all intended order.
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.
noun
- A pin inserted through holes at the end of an axle or shaft, so as to secure a wheel or shaft-mounted device.“In ij camellis ferri vocatis lynspins emptis pro carectis iiijᵈ.”
- A central cohesive source of stability and security; a person or thing that is critical to a system or organisation.“What is difficult to appreciate, however, is the discrepancy between his statement to the 'Manchester Guardian' correspondent and his known abhorance for party politics, which is the lynchpin of modern democracy.”
verb
- To adopt as, or serve as, a central cohesive source of stability and security.“The poems turn fear of individual death into an audit of the costs of an aristocratic status quo which is linchpinned by a monarchy indulging in paradigms of social redress that have become cosmetic, opportunities for self-display rather than genuine justice.”