act up

Verb act up has 2 senses

• act up(v = verb.social) carry on - misbehave badly; act in a silly or improper way; "The children acted up when they were not bored"
is one way to misbehave, misconduct, misdemean
Sample sentence:
Somebody ----s

• act up(v = verb.perception) Array - make itself felt as a recurring pain; "My arthritis is acting up again"
is one way to ache, hurt, smart
Sample sentences:
Something ----s
Somebody's (body part) ----s