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Definition of mainstay:

  1. Main support; principal dependence.
  2. The stay extending from the foot of the foremast to the maintop.


guts, backbone, back, keystone, key, vertebral column, gumption, column, tower, anchorman, spinal column, moxie, sand, anchorperson, pillar, linchpin, spine, lynchpin, rachis, ground tackle, grit, anchor, headstone.

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