hum Definition in the Cambridge English Dictionary
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Definition of “hum” - English Dictionary

Definition of "hum" - American English Dictionary

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humverb [I/T]

 us   /hʌm/ (-mm-)
to make a ​continuous, ​lowsound, or to ​sing a ​tune with ​closedlips: [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 ​paperproducts are humming at 97% of ​capacity.

humnoun [C usually sing]

 us   /hʌm/
a ​continuous, ​lowsound: We could ​hear the ​constant hum of ​trafficoutside the ​window.
(Definition of hum from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "hum" - British English Dictionary

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humverb

uk   us   /hʌm/ (-mm-)
[I] to make a ​continuouslowsound: The ​computers were humming in the ​background. What's that ​strange humming ​sound? [I or T] to ​sing without ​openingyourmouth: 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/
a ​continuouslownoise: Our ​house is on a ​mainroad, so we can ​hear the ​constant hum oftraffic. There's an ​annoying hum on this ​computer.
(Definition of hum from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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