hum

nouns

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

"they manifested all the busyness of a pack of beavers"; "there is a constant hum of military preparation"

busyness, hum

a humming noise

"the hum of distant traffic"

hum, humming

sing with closed lips

"She hummed a melody"

hum

is derived from

is derived from

is a type of (narrower)

produce tones with the voice

"She was singing while she was cooking"; "My brother sings very well"

be noisy with activity

"This office is buzzing with activity"

buzz, hum, seethe

is derived from

sound with a monotonous hum

hum, thrum

make a low continuous sound

"The refrigerator is humming"

hum

is derived from

is a type of (narrower)

emit a noise