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1. To become older and more mature. This phrase can also be used when one is annoyed with someone else's immaturity. When I grow up, I want to be an astronaut Oh, grow up and take some responsibility for your actions.
2. To arise or emerge. Protests have grown up all across the nation in response to that incident.
to become mature; to become adult. All the children have grown up and the parents are left with a lot of debts.
1. Become an adult, as in Sam wants to be a policeman when he grows up. [First half of 1500s]
2. Come into existence, arise, as in Similar social problems grew up in all the big cities. [Late 1500s]
3. 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]
To become an adult: I want to be a teacher when I grow up.