Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “hum”

See all translations

hum

verb [I/T]  /hʌm/ (-mm-) us  
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.

hum

noun [C usually sing]  /hʌm/ us  
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)
What is the pronunciation of hum?
Add Cambridge dictionaries to your browser to your website

More American English definitions for “hum”

Definitions of “hum” in other dictionaries

Word of the Day

be as cold as ice

to be extremely cold

Word of the Day

Let’s celebrate! (words and phrases for parties)

by Kate Woodford,
December 17, 2014
​​​ With Christmas and New Year almost upon us, we thought it a good time to look at the language of parties and celebrations. First, let’s start with the word ‘party’ itself. To have or throw a party or, less commonly, to give a party is to arrange a party: We’re having a

Read More 

cinderella surgery noun

December 15, 2014
cosmetic surgery to the feet We have all heard of people having nose jobs, boob jobs and liposuction – but now a new trend growing in popularity in America: Cinderella surgery.

Read More