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Elementary Dictionary
       

hum

 
pronunciation:
huhm
parts of speech:
verb, noun
features:
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part of speech: verb
inflections: hums, humming, hummed
definition 1: When something hums, it vibrates with a continuous low sound.
Sometimes you don't notice it, but the refrigerator is always humming.
similar words:
buzz, purr, ring, vibrate
definition 2: When you hum, you make the sound of a song without opening your mouth or lips.
Sophia didn't know the words to the song the children were singing in class, so she just hummed along.
similar words:
sing
definition 3: If something is humming, it is busy and producing a lot.
The owners were happy to see that their business was humming.
similar words:
bustle, buzz, jump, stir
 
part of speech: noun
definition: A hum is the sound or act of humming.
The motor has a loud hum.
similar words:
buzz, purr, vibration
derivation: hummer (n.)
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  bird, insect, instrument, music