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"brighten up" is a correct and commonly used phrase in written English
It means to make something or someone more cheerful or lively. Example: "The sun finally came out and brightened up the dreary day."
Dictionary
Brighten up
verb
To become brighter
Exact(60)
I'll brighten up on Sunday.
Things may brighten up, however.
Posters to brighten up the hallways.
It would certainly brighten up brand Kate.
Nishan Sahibs brighten up grey skies.
They brighten up a dull, dark room.
This fun colourful piece will brighten up a plain jumper.
"We're just here to brighten up people's lives.
That's one way to brighten up the commute, certainly.
Sunday Starting to brighten up, although showers will remain.
"I thought they'd do to brighten up your room.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com