Definition of bread and butter noun from the Oxford Advanced Learner's Dictionary

     

    bread and butter

     noun
    noun
    BrE
     
    ; NAmE
     
    [uncountable]
     
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  1. 1 slices of bread that have been spread with butter a piece of bread and butter
  2. 2(informal) a person or company’s main source of income
See the Oxford Advanced American Dictionary entry: bread and butter