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English definition of “black tie”

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black tie

noun [U] uk   /ˌblækˈtaɪ/ us  
clothes, including for men a black bow tie , worn for very formal social occasions: Do we need to wear black tie?
black-tie
adj uk   us  
a black-tie event Tonight's dinner is black-tie.
Translations of “black tie”
in Chinese (Traditional) (正式的)宴會禮服…
in Chinese (Simplified) (正式的)宴会礼服…
(Definition of black tie from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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