English

Definition of top hat noun from the Oxford Advanced Learner's Dictionary

 

top hat

 noun
noun
BrE BrE//ˌtɒp ˈhæt//
 
; NAmE NAmE//ˌtɑːp ˈhæt//
 
(informal topper)
 
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a man’s tall black or grey hat, worn with formal clothes on very formal occasions
See the Oxford Advanced American Dictionary entry: top hat