verb
A verb is a word that expresses an action or a state of being. In this case, 'acts out' is a verb phrase that indicates the action of performing or portraying something in a dramatic or exaggerated manner.
The child often acts out in class, disrupting the learning environment for others.
Whenever he doesn't get his way, he acts out and throws a tantrum.
She acts out whenever she's feeling stressed and overwhelmed.
His painting acts out his innermost emotions and struggles.