the world > physical sensation > sight and vision > thing seen > appearance or aspect > have (specific) appearance [verb (intransitive)] > have specific facial appearance or expression > change expression > specific (2)
intransitive. Of a person's face or facial expression: to become less animated; to show dismay or disappointment by appearing to droop.
intransitive. Of the face, eyes, etc.: to become animated or lively; to light up, brighten. Also with up.