back bone ( synonym found)
Definition of back bone:

°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.
°any fundamental support, structure, or infrastructure.
Definition of back bone:

°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.
°any fundamental support, structure, or infrastructure.
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