Definition of expletive noun from the Oxford Advanced American Dictionary

     

    expletive

     noun
    noun
    NAmE//ˈɛksplət̮ɪv//
     
    (formal)
     
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  1. 1a word, especially an offensive word, that you use when you are angry or in pain synonym swear word
  2. 2 He dropped the book on his foot and muttered several expletives under his breath.
See the Oxford Advanced Learner's Dictionary entry: expletive