(hums, humming, hummed)
1.
If something hums, it makes a low continuous noise.
The birds sang, the bees hummed...
There was a low humming sound in the sky.
VERB: V, V-ing
•
Hum is also a noun.
...the hum of traffic...
N-SING: oft the N of n
2.
When you hum a tune, you sing it with your lips closed.
She was humming a merry little tune...
He hummed to himself as he opened the trunk.
VERB: V n, V
3.
If you say that a place hums, you mean that it is full of activity.
The place is really beginning to hum...
On Saturday morning, the town hums with activity and life.
VERB: V, V with n
4.
Hum is sometimes used to represent the sound people make when they are not sure what to say.
Hum, I am sorry but I thought you were French.
CONVENTION
5.