To make a low, prolonged sound, like that of a bee in flight; to drone; to murmur; to buzz; as, a top hums.

To make a nasal sound, like that of the letter m prolonged, without opening the mouth, or articulating; to mumble in monotonous undertone; to drone.

To make an inarticulate sound, like h'm, through the nose in the process of speaking, from embarrassment or a affectation; to hem.

To sing with shut mouth; to murmur without articulation; to mumble; as, to hum a tune.

A low monotonous noise, as of bees in flight, of a swiftly revolving top, of a wheel, or the like; a drone; a buzz.

Any inarticulate and buzzing sound

A buzz or murmur, as of approbation.

An inarticulate nasal sound or murmur, like h'm, uttered by a speaker in pause from embarrassment, affectation, etc.

Ahem; hem; an inarticulate sound uttered in a pause of speech implying doubt and deliberation.

A term used to describe the 60 or 120-hps sound present in the sound of some communications equipment. Usually hum is the result of undesired coupling to a 60-hps source or to the defective filtering of 120-hps ripple output of a rectifier.

is an undesired tonal signal usually caused by mains electricity (hence centred around 120 Hz). Microphones reduce this by a humbuck coil. Other audio equipment needs to be properly grounded and isolated to reduce hum

sing with closed lips; "She hummed a melody"

be noisy with activity; "This office is buzzing with activity"

sound with a monotonous hum

make a low continuous sound; "The refrigerator is humming"

is an undesired low-frequency tone present in a signal often caused by poor grounding of equipment or or proximity to a magnet field. Also called 60 cycle buzz.

Low-pitched drone coming from electronic equipment. It usually derives from the mains supply.

Vocal sound made with closed lips.

A hum is a sound made by singing a wordless tone with the mouth completely closed, forcing the sound to emerge from the nose. To hum is to produce such a sound, most often with a melody. This necessarily keeps the volume at a low level, so humming is rarely used in musical productions, with some exceptions such as scat singing and vocables.