a prominent supporter;
"he is a pillar of the community"
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"
the forestay that braces the mainmast
- He is the mainstay of our theatre group.
- Farming is still the mainstay of this country.