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English definition of “black tie”

black tie

noun [U]     /ˌblækˈtaɪ/
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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