backbone - definition and synonyms

 
noun 

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/ˈbækˌbəʊn/
singularbackbone
pluralbackbones
  1. 1
    [countable] the row of small bones that goes down the middle of your back
  2. 2
    [uncountable] the determination and strong personality that you need in order to do what is right or deal with a difficult situation

    They wouldn’t have the backbone to disagree with him.