noun
a person who has recently become rich, especially one who flaunts their wealth in a flashy or extravagant way
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The nouveau riche family built a lavish mansion in the upscale neighborhood.
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The nouveau riche couple threw a fancy party to show off their wealth.
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The nouveau riche dude is always flaunting his money on social media.
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The sudden success of the startup turned the founders into nouveau riche overnight.