grow into somebody/something phrasal verb ( see also ↑ grow )
1 . to develop over time and become a particular kind of person or thing:
Sue grew into a lovely young woman.
The two-part show has grown into a full-fledged series.
2 . to gradually learn how to do a job or deal with a situation successfully:
She will grow into her new role over the next few months.
3 . if a child grows into clothes, he or she becomes big enough to wear them