'Linchpin' definitions:
Definition of 'linchpin'
(from WordNet)
noun
A central cohesive source of support and stability; "faith is his anchor"; "the keystone of campaign reform was the ban on soft money"; "he is the linchpin of this firm" [syn: anchor, mainstay, keystone, backbone, linchpin, lynchpin]
noun
Pin inserted through an axletree to hold a wheel on [syn: linchpin, lynchpin]
Definition of 'Linchpin'
From: GCIDE
- Linchpin \Linch"pin`\ (l[i^]nch"p[i^]n`), n. [AS. lynis the axletree; akin to D. luns linchpin, OS. lunisa, LG. lunse, G. l["u]nse, OHG. lun peg, bolt.] A pin used to prevent the wheel of a vehicle from sliding off the axletree. [1913 Webster]