verb
- to make a low continuous sound
- to sing with closed lips without words
- to be busy with activity
Usage: informal
noun
- a low continuous sound
- busy activity or excitement
Usage: informal
Examples
- The air conditioner hummed quietly in the background.
- She hummed her favorite tune while cooking dinner.
- The office was humming with activity before the big presentation.
- We could hear the hum of traffic from the highway.
- There was a hum of excitement in the crowd before the concert.
- The refrigerator’s hum kept me awake at night.
- He hummed along to the radio while driving.