Definition of sweetheart noun from the Oxford Advanced American Dictionary

     

    sweetheart

     noun
    noun
    NAmE//ˈswithɑrt//
     
     
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  1. 1 [singular] used to address someone in a way that shows affection Do you want some ice cream, sweetheart?
  2. 2 [countable] (becoming old-fashioned) a person with whom someone is having a romantic relationship They were childhood sweethearts.
See the Oxford Advanced Learner's Dictionary entry: sweetheart