To perform a role or scene from a play, movie, or story. The students were asked to act out a scene from Shakespeare's 'Hamlet'.
To express one's emotions or feelings through actions rather than words, often in a disruptive manner. When he gets frustrated, he tends to act out instead of talking about his feelings.
To demonstrate or illustrate something by performing it. The teacher asked the children to act out the process of photosynthesis to help them understand it better.