nightcap
noun [ C ] uk/ˈnaɪt.kæp/ us/ˈnaɪt.kæp/
(DRINK)
睡前饮料（常指酒）
a drink, sometimes an alcoholic drink, that someone has just before going to bed
(HAT)
（尤指旧时的）睡帽
a type of hat made from soft cloth and worn in bed, especially in the past