Longman Dictionary of Contemporary English homepage

Topic: HUMAN

backbone

 noun
     
backbone
back‧bone
1 [countable]HBAHBH the row of connected bones that go down the middle of your back [= spine]
2

the backbone of something

the most important part of an organization or group of people:
Farmers are the backbone of this community.
3 [uncountable] courage and determination:
Stuart doesn't have the backbone to be a good manager.
Definition of backbone from the Longman Dictionary of Contemporary English within
the topic HUMAN
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