/ ˌaʊtˈgrəʊ; NAmE -ˈgroʊ/ verb ( out·grew / -ˈgruː; NAmE / out·grown / -ˈgrəʊn; NAmE -ˈgroʊn/) [ vn ]
1.
to grow too big to be able to wear or fit into sth
SYN grow out of :
She's already outgrown her school uniform.
The company has outgrown its offices.
2.
to grow taller, larger or more quickly than another person :
He's already outgrown his older brother.
3.
to stop doing sth or lose interest in sth as you become older
SYN grow out of :
He's outgrown his passion for rock music.