Part of speech: noun

The spine or vertebral column; firmness; resolution.

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Usage examples "backbone":

  1. Or weakness of the backbone. - "Dixie Hart", Will N. Harben.
  2. You'd be surprised to know how easy it is to break a lion's backbone, especially if it's a young lion. - "Careers of Danger and Daring", Cleveland Moffett.
  3. If they have not the backbone to produce what they feel they ought to produce, without regard to what the public wants, then good- bye to progress of any kind. - "Another Sheaf", John Galsworthy.