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Phrase Meanings » grow up
What does "grow up" mean?
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Become an adult, as in Sam wants to be a policeman when he grows up. [First half of 1500s]
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Come into existence, arise, as in Similar social problems grew up in all the big cities. [Late 1500s]
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Become mature or sensible, as in It's time you grew up and faced the facts. This usage may also be in the form of an imperative (as in Don't bite your nails—grow up!) [Mid-1900s]
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