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grownup

American  
[grohn-uhp] / ˈgroʊnˌʌp /

noun

  1. a mature, fully grown person; adult.


Etymology

Origin of grownup

First recorded in 1805–15; noun use of verb phrase grow up

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Above all, size your positions like a grownup.

From MarketWatch • Mar. 26, 2026

Mr. Reiner later recalled that Norman Lear was the first grownup to say he was funny, when he was around 7 or 8.

From The Wall Street Journal • Dec. 15, 2025

For a more grownup affair, consider a caramel apple sangria.

From Washington Times • Nov. 15, 2023

The star was the collection’s motif, seen on stretch dresses and pleated denim mini skirts worn with knee socks — caught somewhere between girlhood and the grownup world.

From Seattle Times • Feb. 24, 2023

During the proceedings, the ritual mumbo-jumbo and the tea and cookies afterward, we acted like responsible, grownup parents.

From "Cat's Eye" by Margaret Atwood