brighten
Americanverb (used with or without object)
verb
-
to make or become bright or brighter
-
to make or become cheerful
Other Word Forms
- brightener noun
- rebrighten verb
- unbrightened adjective
Etymology
Origin of brighten
First recorded in 1250–1300, brighten is from the Middle English word brightnen. See bright, -en 1
Explanation
To brighten is to make something lighter, the way you brighten your back yard with glowing patio lights or brighten up your gloomy bedroom by painting the walls yellow. When the sun comes out after several rainy days, it brightens your house and the walk to school, but it can also brighten your mood. This verb is perfect for both ways of making things light and cheerful — adding something that emits light or lending a happy or hopeful mood to a situation. Your best friend may be so funny and positive that they brighten a room just by walking in.
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.
If fresh ice was exposed, why did the comet not brighten right away?
From Science Daily • Mar. 21, 2026
Finally, consider setting up what I think of as a zhush station — a small collection of ingredients that allow guests to brighten and customize what’s on their plate.
From Salon • Mar. 15, 2026
"Through some of the darkest days of my career, with his infectious smile he would walk in and brighten up every single day."
From BBC • Feb. 16, 2026
His massive social and economic development plan, called Vision 2030, aims to brighten Saudi Arabia’s global image, woo international tourists and high-skilled expatriates from the West and wean the kingdom off its reliance on petrodollars.
From The Wall Street Journal • Feb. 14, 2026
Naomi thought she saw his eyes brighten a bit.
From "Out of Darkness" by Ashley Hope Pérez
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
