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Definition of backbone:

  1. Anything like , or serving the purpose of, a backbone.
  2. Firmness; moral principle; steadfastness.
  3. The column of bones in the back which sustains and gives firmness to the frame; the spine; the vertebral or spinal column.

Synonyms:

pricker, sticker, anchorperson, moxie, spinal column, rachis, dorsum, vertebral column, headstone, sand, horse sense, rear, acantha, grit, common sense, mother wit, pillar, good sense, thorn, book binding, spikelet, backrest, cover, anchorman, ground tackle, prickle, binding, back, gumption, firmness, spur, mainstay, keystone, gritstone, guts, sense, gritrock, lynchpin, spine, anchor, linchpin, vertebrae, key.

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