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Discover LudwigThe term "act up" is correct and usable in written English.
You can use "act up" to mean "to behave badly, especially in an annoying or rebellious way." For example, "My daughter has been acting up lately, refusing to do her chores or listen to me."
Dictionary
act up
verb
To misbehave; to cause trouble.
synonyms
Exact(58)
ACT UP Ithaca Records, #7561.
Cleaned me act up now, of course".
He doesn't act up, he acts down.
ACT UP Oral History Project Digital Collection, 2002-2015.
Act Up set the gold standard for effective guerrilla activism.
"They all act up because they're around girls," he said.
Activists from Aids group Act Up called his stance "bull****".
"Kids here and everywhere in the world will act up".
"Act Up didn't come out of a vacuum," he observed.
Similar(2)
Still, some ACT-UP demands are unrealistic.
They have ACT-UP".
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com