verb \ˈhəm\

: to make a low continuous sound

: to sing the notes of a song while keeping your lips closed

: to be very active or busy


Full Definition of HUM

intransitive verb
a :  to utter a sound like that of the speech sound \m\ prolonged
b :  to make the natural noise of an insect in motion or a similar sound :  drone
c :  to give forth a low continuous blend of sound
a :  to be busily active <the museum hummed with visitors>
b :  to run smoothly <the business started to hum>
transitive verb
:  to sing with the lips closed and without articulation
:  to affect or express by humming <hummed his displeasure>
hum noun
hum·ma·ble \ˈhə-mə-bəl\ adjective

Examples of HUM

  1. The garden was humming with bees.
  2. The refrigerator hummed in the background.
  3. I was humming to myself.
  4. We hummed along to the music.
  5. I hummed a little song.
  6. By noon, the office was really humming.
  7. The restaurant hums on weekends.

Origin of HUM

Middle English hummen; akin to Middle High German hummen to hum, Middle Dutch hommel bumblebee
First Known Use: 14th century


Definition of HUM

chiefly British variant of hem


noun \ˈhəm\   (Medical Dictionary)

Medical Definition of HUM

: a sound like that made by humming; especially : venous hum


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