hum
🇺🇸
/hʌm/
🇬🇧
/hʌm/
to make a tune with closed lips
She likes to hum while she works.
to make a low, steady sound
The machine makes a soft hum when it's on.
to be busy and active
The city streets hum with people in the morning.
a low, steady sound
I heard a quiet hum coming from the kitchen.