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Act Up (Verb)

Make itself felt as a recurring pain; "My arthritis is acting up again".

Verbs of seeing, hearing, feeling.

My knee injury always acts up when the weather changes.
Her sciatica is acting up again, making it hard for her to walk.
The stress of the job is making my migraines act up more frequently.
It seems that my old shoulder injury is acting up now that I've stopped exercising.
My lower back is acting up, so I think I need to see a chiropractor again.

Misbehave badly; act in a silly or improper way; "The children acted up when they were not bored".

Verbs of political and social activities and events.

The kids started acting up as soon as we pulled into the long road trip.
During the meeting, some employees acted up when the idea of longer work hours was proposed.
She acts up and becomes defensive whenever someone criticizes her artwork.
If you continue acting up, you will have to leave the theater immediately.
The students acted up and refused to do their homework when the teacher wasn't looking.