Meaning of 'hum'

noun

a humming noise

Example: "the hum of distant traffic"

Synonyms: humming

noun

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

Synonyms: busyness

verb

sing with closed lips

Example: "The chorus hummed a melody."

verb

make a low continuous sound

Example: "The refrigerator is humming"

verb

sound with a monotonous hum

Synonyms: thrum

verb

be noisy with activity

Synonyms: buzz