Definition of nightcap noun from the Oxford Advanced Learner's Dictionary

     

    nightcap

     noun
    noun
    BrE BrE//ˈnaɪtkæp//
     
    ; NAmE NAmE//ˈnaɪtkæp//
     
    Clothes
     
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  1. 1a drink, usually containing alcohol, taken before going to bed
  2. 2 (in the past) a soft cap worn in bed See related entries: Clothes
See the Oxford Advanced American Dictionary entry: nightcap