white-tie

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˌwhite-ˈtie adjective [only before noun]  a white-tie social occasion is a very formal one at which the men wear white bow ties and tails 〔社交活动〕男士须打白领结并穿燕尾服的，非常正式的 → black-tie

ˌwhite-ˈtie adjectiveChineseSyllable  

white-tie
ˌwhite-ˈtie adjective [only before noun]
a white-tie social occasion is a very formal one at which the men wear white bow ties and tails ⇨ black-tie

white-tieBrE /ˌwaɪt ˈtaɪ/ 🔊NAmE /ˌwaɪt ˈtaɪ/ 🔊 adjective(of social occasions 社交场合) very formal, when men are expected to wear white bow ties and jackets with tails 非常正式的；要求男士穿燕尾晚礼服打白领结的◆Is it a white-tie affair? 这是个穿夜礼服的聚会吗？🔊🔊