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black tie

noun [U]
 
 
/ˌblækˈtaɪ/

Definition

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
a black-tie event Tonight's dinner is black-tie.The style, appearance, and make-up of clothes
(Definition of black tie noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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