Verb
make itself felt as a recurring pain
misbehave badly; act in a silly or improper way
Source: WordNetMy arthritis is acting up again Source: Internet
The children acted up when they were not bored Source: Internet
Unfortunately, I can't predict when the will act up, so all I can do is document that I took the car in for that reason and when/if the blows out way too early, I, at least, have proof that I tried to fix the problem. Source: Internet
One other wrote, "You gon make me act up. Source: Internet
Brown will be eligible to play on week 9 whether he gets signed or not and the NFL can add to the suspension if he continues to act up. Source: Internet
“When my kids would act up the way Donald Trump acted up last night I would call the parents,” she said. Source: Internet