To emit a continuous low droning sound like that of the speech sound (m) when prolonged.
예문
1. hum to oneself (혼자서 콧노래를 흥얼거리다) 2. A bee hums. (벌이 윙윙거린다) 3. after some hums and ha's (몇 번이나 흠흠 한 다음) 4. the household humming with wedding preparation (결혼 준비로 분주한 집안) 5. hum a child to sleep (콧노래를 불러 아이를 재우다)
