Definition of grow into
1 : to become (something) as time passes She has grown into an accomplished and charming young woman. His small company has grown into a huge international corporation.
2 : to become large enough for (a certain size of clothing) Ben will grow into Billy's shoes in a year or two.
Seen and Heard
What made you want to look up grow into? Please tell us where you read or heard it (including the quote, if possible).