acting out (Noun) — A (usually irritating) impulsive and uncontrollable outburst by a problem child or a neurotic adult.
acting out (Noun) — (psychiatry) the display of previously inhibited emotions (often in actions rather than words); considered to be healthy and therapeutic.
acting out (Verb) — Represent an incident, state, or emotion by action, especially on stage.
acting out (Verb) — Act out; represent or perform as if in a play. ex. "She acted out what had happened earlier that day"