to make a low, continuous, droning sound.

to give forth an indistinct sound of mingled voices or noises.

to utter an indistinct sound in hesitation, embarrassment, dissatisfaction, etc.; hem.

to sing with closed lips, without articulating words.

to be in a state of busy activity

The household hummed in preparation for the wedding.

British Slang . to have a bad odor, as of stale perspiration.

to sound, sing, or utter by humming

to hum a tune.

to bring, put, etc., by humming

to hum a child to sleep.

the act or sound of humming; an inarticulate or indistinct murmur; hem.

Audio . an unwanted low-frequency sound caused by power-line frequencies in any audio component.

(an inarticulate sound uttered in contemplation, hesitation, dissatisfaction, doubt, etc.)

verb

bombilate , bombinate , bum , bumble , croon , drone , moan , mumble , murmur , purr , rustle , sing , sing low , sound , strum , throb , thrum , trill , warble , whir , whisper , zoom , burr , buzz , whiz , blur , speed , susurrate , vibrate

noun

bumble , burr , buzz , drone , whir , whiz