noun
a fully developed adult
adjective
matured or developed in a physical, mental, or emotional way
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As I have grown up, I have come to appreciate the importance of hard work and dedication.
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I can't believe how fast time has flown by; it feels like just yesterday we were kids and now we're all grown up.
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I feel like such a grown-up now that I have my own apartment and bills to pay.
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Her ideas have really grown up over the years, becoming more sophisticated and nuanced.