Meaning of “top hat” in the English Dictionary

british dictionary

"top hat" in British English

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top hatnoun [ C ]

uk /ˌtɒp ˈhæt/ us /ˌtɑːp ˈhæt/ informal topper

a tall, black or grey hat worn by men on some formal occasions, especially in the past

(Definition of “top hat” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)