Backbone

Noun

  • The series of vertebrae, separated by disks, that encloses and protects the spinal cord, and runs down the middle of the back in vertebrate animals.
  • courage, fortitude, or strength

    "He would make a good manager, if he had a little more backbone."

  • any fundamental support, structure, or infrastructure

    "Before automobiles, railroads were a backbone of commerce."

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