to change (one's) hue: (of a person) to undergo an alteration in the colour of one's complexion in response to something which has happened, been…

to change colour (also †colours): (of a person) to have one's complexion alter in colour in response to something which has happened, been said…

to change countenance (also face): (of a person) to have one's facial expression or colour alter in response to something which has happened, been…

intransitive. To turn pale or blush; to change countenance. Obsolete.