Meaning of “grow out of sth” - Learner’s Dictionary

grow out of sth

phrasal verb with grow uk us /ɡrəʊ/ verb (past tense grew, past participle grown)
CLOTHES

If children grow out of clothes, they gradually become too big to wear them:

Adam's grown out of his shoes.
STOP

to stop doing something as you get older:

He still bites his nails, but hopefully he'll grow out of it.

(Definition of “grow out of sth” from the Cambridge Learner’s Dictionary © Cambridge University Press)