hum

noun

  1. 1

    a humming noise

    the hum of distant traffic

  2. 2

    an Islamic fundamentalist group in Pakistan that fought the Soviet Union in Afghanistan in the 1980s; now operates as a terrorist organization primarily in Kashmir and seeks Kashmir's accession by Pakistan

    the hum of distant traffic

  3. 3

    the state of being or appearing to be actively engaged in an activity

    they manifested all the busyness of a pack of beavers

    there is a constant hum of military preparation

verb

  1. 1

    sing with closed lips

    She hummed a melody

  2. 2

    make a low continuous sound

    The refrigerator is humming

  3. 3

    sound with a monotonous hum

  4. 4

    be noisy with activity

    This office is buzzing with activity

Synonyms

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