grow up

Verb

grow up (third-person singular simple present grows up, present participle growing up, simple past grew up, past participle grown up)

1. (intransitive) To mature and become an adult.
   • What do you want to be when you grow up?
   • Attila grew up a nomad on the plains of Hungary

   Synonyms:

   age, upgrow

2. (intransitive) To start to develop; to flourish.
   • Socialism grew up in the industrial cities.
   • A town grew up at the junction of the two rivers.

   Synonyms:

   blossom, prosper

3. (idiomatic, intransitive) To stop acting as or like a child (often used as an imperative interjection).
   • Will you grow up please, and stop making silly faces?

Interjection

1. (imperative) Used to criticize childish behavior, especially that considered unreasonable for one's age.
   • You're giggling because I said "butt"? Grow up, seriously.
   • Grow up! The Bible is nothing more than a astrotheological allegory for things like the Sun!