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Definition of hum : 1. A buzz or murmur, as of approbation.
2. A kind of strong drink formerly used.
3. A low monotonous noise, as of bees in flight, of a swiftly revolving top, of a wheel, or the like; a drone; a buzz.
4. Ahem; hem; an inarticulate sound uttered in a pause of speech implying doubt and deliberation.
5. An imposition or hoax.
6. An inarticulate nasal sound or murmur, like h'm, uttered by a speaker in pause from embarrassment, affectation, etc.
7. Any inarticulate and buzzing sound
8. The confused noise of a crowd or of machinery, etc., heard at a distance; as, the hum of industry.
9. To express satisfaction by a humming noise.
10. To express satisfaction with by humming.
11. To flatter by approving; to cajole; to impose on; to humbug.
12. To have the sensation of a humming noise; as, my head hums, - a pathological condition.
13. To make a low, prolonged sound, like that of a bee in flight; to drone; to murmur; to buzz; as, a top hums.
14. 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.
15. To make an inarticulate sound, like h'm, through the nose in the process of speaking, from embarrassment or a affectation; to hem.
16. To sing with shut mouth; to murmur without articulation; to mumble; as, to hum a tune.

Synonyms:

vibrate, rumor/word/legend has it that, carol, warble, groan, bumble, busy season, madhouse, frenzy, chirr, humming, blast away, it/that depends, growl, moan, bum, baton, accompany, sing without articulation, resonate, atmospherics, blast, Grand Central Station, sound, not that I'm aware of, perhaps, articulation, clunk, maybe, whisper, beat out, whir, make a buzzing sound, chirrup, boil, thud, hectic, whiz, sing low, busyness, croon, bang out, bombinate, pulsate, hum a tune, I dare say, churr, strum, zoom, I would think/imagine/hope etc., peak, sing in an undertone, back, lively, roar, bombilate, bustling, pitch, presumably, resound, murmur, burr, arrange, seethe, purr, reportedly, sounds, chirp, sing

drone, chant, reverberation, rattle, chatter, buzz, rumble, racket, throb, thrum, thunder, reverberate, clatter, grumble, drum, beat, roll

Usage examples:

• You bet I am going to make things hum, so I can offer you anything you want." - "A Daughter of the Land", Gene Stratton-Porter.
• The distant hum in the street is rising steadily. - "The Project Gutenberg Plays of John Galsworthy, Complete", John Galsworthy.
• " Couldn't keep her to hum," he said, " when she seen me hitchin' up old Charlie." - "The Flag", Homer Greene.