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English definition of “black tie”

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?Clothes which cover most of the body
black-tie
adj uk   us  
a black-tie event Tonight's dinner is black-tie.The style, appearance, and make-up of clothes
(Definition of black tie from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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