noun
a person who seeks attention by displaying their accomplishments or possessions
verb
to behave in a way that is intended to attract attention or admiration
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She always finds a way to subtly show off her intelligence during meetings.
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He loves to show off his new car to all his friends.
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She's always flexing on social media, trying to show off her wealth.
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The peacock spreads its feathers to show off its beauty in front of potential mates.