- 1 outgrow something to grow too big to be able to wear or fit into something synonym grow out of She's outgrown most of her clothes. The company has outgrown its offices.
- 2outgrow somebody to grow taller, larger, or more quickly than another person He's already outgrown his older brother.
- 3outgrow something to stop doing something or lose interest in something as you become older synonym grow out of He's outgrown his passion for rock music.
NAmE//ˌaʊtˈɡroʊ//Verb Forms present simple I / you / we / they outgrow
he / she / it outgrows
past simple outgrew
past participle outgrown
-ing form outgrowing