1.
while humming; humming along; humming cheerfully
Doing something while humming a tune, typically conveying a relaxed, cheerful, or carefree mood.
A compound of 鼻歌 (humming, singing through the nose) and まじり (mixed with, accompanied by). Describes doing an activity while casually humming, implying the person is in a good mood or at ease.
The expression paints a vivid picture of someone going about their daily tasks in a light, carefree manner. It often appears in literary descriptions and everyday speech.