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backbone (noun)
A coluna vertebral é o principal suporte do corpo.
Think of your 'back' + 'bone'. It is the 'bone' that holds your 'back' up. Without it, you would fall down like a noodle...
He has a strong background of the company. → He is the backbone of the company.
The workers are the backbones of the factory. → The workers are the backbone of the factory.
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