Act on: Act decisively on the basis of information received or deduced
Act on: Take action against something
Act on: Affect something
Act out: Perform a scene from a play, a charade or an exercise
Act out: Perform a fantasy in reality
Act out: Express one’s feelings through disruptive actions
Act out: Express ideas or desires through actions rather than words
Act up: Misbehave; cause trouble
Act up to: Equal in action; fulfill in practice
Act upon: Take action on the basis of information received or deduced