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backbone

From Longman Dictionary of Contemporary English
Related topics: Human
backboneback‧bone /ˈbækbəʊn $ -boʊn/ ●○○ noun  1 skeleton.jpg [countable]HBAHBH the row of connected bones that go down the middle of your back syn spine2 the backbone of something3 [uncountable]GOOD/MORAL courage and determination Stuart doesn’t have the backbone to be a good manager.
Examples from the Corpus
backboneThis, at least, is some suggestion of a backbone, but the larva does not keep it for very long.But they and other progressives had both the brass and backbone to make themselves heard.This effectively creates a limited number of entry points into the backbone and simplifies network management.
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