 |
| |||||||||
grown-up1
1 fully developed as an adult : 
Before you know it, the children will be grown-up and leaving home.I've got two grown-up sons.
Before you know it, the children will be grown-up and leaving home.I've got two grown-up sons.2 behaving in a responsible way, like an adult [= mature; ↪ childish]: I expect more grown-up behaviour of you.
I expect more grown-up behaviour of you.