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hum

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hum/ˈhʌm/verb
humshummedhumming
hum
/ˈhʌm/
verb
humshummedhumming
Learner's definition of HUM  
[no object] : to make a low continuous sound
: to sing the notes of a song while keeping your lips closed
[no object]
[+ object]
[no object] : to be very active or busy

— hum

noun,[singular]
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