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Synonyms for hum

verb

buzz, drone, murmur, sing low, hum a tune, croon, sing in an undertone, whisper, sing without articulation, zoom, moan, make a buzzing sound, bombinate, thrum, bum, whir, vibrate, bombilate, purr; see also sound 1.

See hum in Webster's New World Roget's A-Z Thesaurus II

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