suffix, godan verb (-mu)
show signs of; appear to be; become somewhat
Attaches to nouns to form godan verbs meaning 'to show signs of that noun' or 'to become slightly like that noun'. Often describes a visible or tangible state. Common examples include 黄ばむ (to become yellowish) and 汗ばむ (to be slightly sweaty).
古い本のページが黄ばんでいる。
The pages of the old book are yellowing.
運動の後で額が汗ばんだ。
My forehead was slightly sweaty after exercise.