nightcap

noun
🔊/ˈnaɪtkæp/
🔊/ˈnaɪtkæp/
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  1. a drink, usually containing alcohol, taken before going to bed睡前饮料;(常指)夜酒
  2. (in the past) a soft cap worn in bed(旧时的)睡帽Topics Clothes and Fashionc2