Definition of 'hum'

Noun

1. 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"
      Synonyms: busyness
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
      Synonyms: Harkat-ul-Mujahidin Harkat ul-Ansar HUA Harkat ul-Mujahedeen Al Faran Movement of Holy Warriors
3. a humming noise; "the hum of distant traffic"
      Synonyms: humming

Verb

1. sing with closed lips; "She hummed a melody"
2. be noisy with activity; "This office is buzzing with activity"
      Synonyms: buzz seethe
3. sound with a monotonous hum
      Synonyms: thrum
4. make a low continuous sound; "The refrigerator is humming"

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