noun, noun or participle which takes 'suru'
change in facial appearance; change of face
Refers to a noticeable change in how someone's face looks, often due to emotion, aging, or a sudden transformation. Can be used as a noun or with する to describe the act of changing one's facial expression or appearance.
See also: 面変わり
怒ったときの彼の顔変わりには驚いた。
I was surprised by the change in his face when he got angry.
久しぶりに会った友人は、すっかり顔変わりしていた。
My friend, whom I met after a long time, had completely changed in facial appearance.