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Definition of “hum” - English Dictionary

"hum" in American English

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humverb [I/T]

 us   /hʌm/ (-mm-)
to make a continuous, low sound, or to sing a tune with closed lips: [I] Debbie always hums to herself when she listens to music. [T] I’ve forgotten how that tune goes – could you hum it for me?
fig. If something is humming, it is very busy and full of activity: [I] Factories that make paper products are humming at 97% of capacity.

humnoun [C usually sing]

 us   /hʌm/
a continuous, low sound: We could hear the constant hum of traffic outside the window.
(Definition of hum from the Cambridge Academic Content Dictionary © Cambridge University Press)







"hum" in British English

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humverb

uk   us   /hʌm/ (-mm-)
[I] to make a continuous low sound: The computers were humming in the background. What's that strange humming sound?
[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?
[I] informal to be busy and full of activity, excitement, sounds, or voices: The bar was really humming last night.

humnoun [C usually singular]

uk   us   /hʌm/
(Definition of hum from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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