noun
a riverboat used as a theater or restaurant
verb
to behave in a showy or ostentatious manner
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The showboat was a popular form of entertainment in the early 20th century.
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That guy is such a showboat, always trying to steal the spotlight.
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Don't be such a showboat, just let someone else have a turn.
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His flashy car is like a showboat, drawing attention wherever he goes.