# grow up

> English word · Verb

## Definitions
1. To mature and become an adult.
2. To start to develop; to flourish.
3. To stop acting as or like a child (often used as an imperative interjection).

## Etymology
Dissimilated from Middle English upgrowen.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/word/grow-up