1. (noun) pillar, mainstay
a prominent supporter
Synonyms: pillar, backbone, column, lynchpin, linchpin, anchor, tower, keystone, mainstay
2. (noun) anchor, mainstay, keystone, backbone, linchpin, lynchpin
a central cohesive source of support and stability
Synonyms: anchorman, key, linchpin, ground tackle, lynchpin, rachis, headstone, grit, sand, anchorperson, spinal column, keystone, guts, back, backbone, pillar, spine, anchor, mainstay, moxie, gumption, vertebral column
3. (noun) mainstay
the forestay that braces the mainmast
Synonyms: linchpin, lynchpin, keystone, backbone, pillar, anchor
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Synonyms and Antonyms of mainstay 
