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English definition of “hum”

hum

verb     /hʌm/ (-mm-)
[I] to make a continuous low sound: The computers were humming in the background. What's that strange humming sound?Sounds made by objects, movement or impact [I or T] to sing without opening your mouth: She hummed to herself as she walked to school. I've forgotten how that tune goes - could you hum it for me?Singing in general [I] informal to be busy and full of activity, excitement, sounds, or voices: The pub was really humming last night.Busy and activeHurrying and doing things quickly
(Definition of hum verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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