English definition of “act”
BEHAVE [I] › to behave in a particular way: to act responsibly Jeff's been acting strangely recently. Stop acting like a child!
DO SOMETHING [I] › to do something, especially in order to solve a problem: We have to act now to stop the spread of this disease.
PERFORM [I, T] › to perform in a play or film: He's acted in a number of successful Hollywood films.