showboat

[ shoh-boht ]
/ ˈʃoʊˌboʊt /

noun Also show·boat·er (for defs 2, 3).

a boat, especially a paddle-wheel steamer, used as a traveling theater.
Informal. show-off(def 1).
a person, especially an athlete, who performs in an ostentatiously sensational manner calculated to draw attention; show-off.

verb (used without object)

to perform or behave in an outrageous or spectacular manner.

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Origin of showboat

An Americanism dating back to 1865–70; show + boat
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for showboater

showboat
/ (ˈʃəʊˌbəʊt) /

noun

a paddle-wheel river steamer with a theatre and a repertory company

verb

(intr) to perform or behave in a showy and flamboyant way
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012