devil's mask; frightening face
Refers to a mask depicting a demon or oni, or metaphorically to a terrifying expression. Often used in contexts like Noh theater, festivals, or describing a scary look.
An actor wearing a devil's mask appeared on the Noh stage.
His angry face was just like a devil's mask.
stern face, kind heart
Compound of 鬼 (oni, demon) and 面 (men, mask/face). The exact historical derivation is straightforward; the word has been used for demon masks in traditional performing arts.