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English definition of “grow up”

grow up

phrasal verb with grow    /ɡroʊ/ verb (past tense grew  /ɡru/, past participle grown  /ɡroʊn/)
to change from being a child to being an adult: She grew up on a Pennsylvania farm. If you say “grow up” to someone, you are telling the person to stop behaving like a child.
(Definition of grow up from the Cambridge Academic Content Dictionary © Cambridge University Press)
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