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English definition of “grown up”

grown up

adjective uk   /ˌɡrəʊnˈʌp/ us    /ˌɡroʊn-/
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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(Definition of grown up adjective from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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