hum

To hum is to make a low, steady, singing sound with your mouth closed. If you don't know the words to a song on the radio, you can just hum along.

Other hums are based on the musical hum, making a similar low, constant sound. Bees hum, an electric fan hums, and your car idling quietly also hums. A figurative way to hum is to be busy and loud: "The cafe always seemed to hum with activity." The word hum is imitative (it sounds like the noise it describes), but its earliest form was hommen, in the 1500s, meaning "make a murmuring sound to cover embarrassment."

Definitions of hum
1

v sing with closed lips

“She hummed a melody”
Type of:
sing
produce tones with the voice

v make a low continuous sound

“The refrigerator is humming
Type of:
make noise, noise, resound
emit a noise

v sound with a monotonous hum

Synonyms:
thrum
Type of:
go, sound
make a certain noise or sound

v be noisy with activity

Synonyms:
buzz, seethe
Types:
pullulate, swarm, teem
be teeming, be abuzz
crawl
be full of
Type of:
be
have the quality of being; (copula, used with an adjective or a predicate noun)

n a humming noise

“the hum of distant traffic”
Synonyms:
humming
Type of:
noise
sound of any kind (especially unintelligible or dissonant sound)

n the state of being or appearing to be actively engaged in an activity

“there is a constant hum of military preparation”
Synonyms:
busyness
Type of:
action, activeness, activity
the state of being active

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