backbone (noun)
The backbone is the series of bones running down the middle of the back of a person or animal, providing support and protecting the spinal cord. Figuratively, it refers to the most important or essential part of something, providing strength and stability.
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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