grow upverb

• 1

  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
• 2

  To start to develop; to flourish.

  • Socialism grew up in the industrial cities.
  • A town grew up at the junction of the two rivers.
• 3

  To stop acting as or like a child (often used as an imperative interjection).

  • Will you grow up please, and stop making silly faces?

grow upintj

• 1

  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!