Definition of cardinal sin noun from the Oxford Advanced Learner's Dictionary

     

    cardinal sin

     noun
    noun
    BrE
     
    ; NAmE
     
     
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  1. 1(sometimes humorous) an action that is a serious mistake or that other people disapprove of He committed the cardinal sin of criticizing his teammates.
  2. 2a serious sin in the Christian Church
See the Oxford Advanced American Dictionary entry: cardinal sin