godan verb (-mu), intransitive verb
become slightly sweaty; get moist with sweat
Describes a light, often noticeable but not drenching sweat, typically from warmth, nervousness, or mild exertion.
緊張して手のひらが汗ばんだ。
My palms got sweaty from nervousness.
夏の朝、少し歩いただけで額が汗ばむ。
On a summer morning, just a short walk makes my forehead slightly sweaty.