Why does the director use noun actions instead of verbs such as act, start and begin when shooting? The reason is that during the performance, the actors are just expressing the film that the director has conceived. When shooting, the director will compare whether the actions performed by the actors conform to their own ideas and feelings. If they are consistent, he will go on to the next shot. If it doesn't feel right, repeat it if it doesn't achieve the effect the director wants.

So the real meaning of action is that the director is ready to watch the actor's performance, which is why he chose to use this term instead of directly using act.