Meaning : Misbehave badly. Act in a silly or improper way.
Example :
The children acted up when they were not bored.
Synonyms : carry on
Meaning : Make itself felt as a recurring pain.
Example :
My arthritis is acting up again.
Act up ka meaning, vilom shabd, paryayvachi aur samanarthi shabd in Marathi. Act up ka matlab kya hota hai?