Is it common to say something important as "backbone"?
Answer from a Native speaker
Yes, it's fairly common. "Backbone" refers to the structure of something, the base that holds everything together or the part of something that makes it successful. Ex: A good education is the backbone of success. Ex: Donations are the backbone of thrift stores. Ex: You don't have a backbone. => this means that you can't stand up for yourself or say your opinions
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