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English definition of “backbone”

backbone

noun [C]     /ˈbækbəʊn/
MAIN PART the main or strongest part of something: The car industry remains the backbone of the area's economy.Important and essential thingsInformation and messages
BONE the line of bones down the centre of your backBone structures
(Definition of backbone noun from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “backbone” in other dictionaries

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