yodan verb with 'mu' ending (archaic), intransitive verb
look daunted; become discouraged
Archaic intransitive verb. Describes a person's expression turning pale or losing spirit when faced with difficulty. The modern equivalent is 鼻白む (はなじろむ), which is also rare but more recognizable.
See also: 鼻白む (はなじろむ)
古い軍記物語では、敵の勢いに鼻白む武士の姿が描かれる。
In old war tales, warriors who look daunted by the enemy's force are depicted.