1.
When someone grows up, they gradually change from being a child into being an adult.
She grew up in Tokyo.
PHRASAL VERB: V P
see also grown-up
2.
If you tell someone to ~, you are telling them to stop behaving in a silly or childish way. (INFORMAL)
It’s time you grew up.
PHRASAL VERB: usu imper, V P disapproval
3.
If something grows up, it starts to exist and then becomes larger or more important.
A variety of heavy industries grew up alongside the port.
PHRASAL VERB: V P