See good night for more good·nightBrE /ˌɡʊdˈnaɪt/ 🔊NAmE /ˌɡʊdˈnaɪt/ 🔊 exclamationused when you are saying goodbye to sb late in the evening, or when they or you are going to bed; in informal use people often just say Night （晚间道别时或睡前用语）晚安（非正式场合常说 Night）