1. (noun)pillar, mainstay a prominent supporter "he is a pillar of the community"
2. (noun)anchor, mainstay, keystone, backbone, linchpin, lynchpin 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"
Definition of 'mainstay'
