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English definition of “hum”

hum

verb uk   /hʌm/ (-mm-) us  
[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

hum

noun [C usually singular] uk   /hʌm/ us  
a continuous low noise: Our house is on a main road, so we can hear the constant hum of traffic. There's an annoying hum on this computer.Sounds made by objects, movement or impact
(Definition of hum from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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