noun
a felt hat that is round and hard with a narrow brim
• Syn: ↑bowler hat, ↑bowler, ↑derby hat, ↑derby
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noun : a man's stiff hat (as a bowler or a top hat)
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plug (def. 19).
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plug hat,
U.S. Informal. a man's high silk hat.
Useful english dictionary. 2012.