backbone
definitions
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noun
the main supporting structure of the spine; a person or thing that provides strength or supporten: the main supporting structure of the spine; a person or thing that provides strength or support
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noun
a strong, flexible rod used in constructionen: a strong, flexible rod used in construction
examples
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She is the backbone of the team.
She is the backbone of the team.
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The roof rests on a steel backbone.
The roof rests on a steel backbone.