backbone
/ˈbækˌboʊn/IPA: /B AE1 K B OW0 N/
noun
- 1
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.
- 2
Any fundamental support, structure, or infrastructure.
“Before automobiles, railroads were a backbone of commerce.”
- 3
Courage, fortitude, or strength.
“He would make a good manager, if he had a little more backbone.”
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