The central supporting element of a whole.
(Architecture) Carved work, somewhat resembling an anchor or arrowhead; part of the ornaments of certain mouldings. It is seen in the echinus, or egg-and-anchor (called also egg-and-dart, egg-and-tongue) ornament.
The definition of a mainstay is something that is depended on, or something that is necessary.
Strength of character; determination:
Find another word for linchpin. In this page you can discover 7 synonyms, antonyms, idiomatic expressions, and related words for linchpin, like: keystone, cornerstone, anchor, mainstay, backbone, lynchpin and lynch-pin.