to do something that you have planned or had previously only thought of doing
Example: He was acting out his feelings of inferiority by being overly aggressive.
to express your thoughts or feelings through your words or behaviour
Example: He was gone so fast Tesla had no choice but to act out at the same time.
to show the events that happened in a situation by doing them again or by doing the same things as the people involved
Example: If something made Ben act out of character and he got drunk and then for some reason he got behind the wheel of that car.