Meaning of “grown up” in the English Dictionary

"grown up" in British English

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grown upadjective

uk /ˌɡrəʊn ˈʌp/ us /ˌɡroʊn ˈʌp/

B2 If you say that someone is grown up, you mean that they are an adult or that they behave in a responsible way:

He seems very grown up for a ten-year-old.
This book is a bit too grown up for you (= you are too young to understand this book).
[ before noun ] She has two grown-up children who work in the family business.

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grown-upnoun [ C ]

uk /ˈɡrəʊn.ʌp/ us /ˈɡroʊn.ʌp/

B2 an adult, used especially when talking to children:

Ask a grown-up to cut the shape out for you.

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(Definition of “grown up” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"grown-up" in American English

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grown-upnoun [ C ]

us /ˈɡroʊnˌʌp/

an adult:

The grown-ups sat inside while the children played in the yard.
adjective [ not gradable ] us /ˈɡroʊnˌʌp/

She has three grown-up sons.

(Definition of “grown-up” from the Cambridge Academic Content Dictionary © Cambridge University Press)