Noun

• S: (n) busyness (busyness%1:26:00::), hum (hum%1:26:00::) (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"
• S: (n) Harkat-ul-Mujahidin (harkat-ul-mujahidin%1:14:00::), HUM (hum%1:14:00::), Harkat ul-Ansar (harkat_ul-ansar%1:14:00::), HUA (hua%1:14:00::), Harkat ul-Mujahedeen (harkat_ul-mujahedeen%1:14:00::), Al Faran (al_faran%1:14:00::), Movement of Holy Warriors (movement_of_holy_warriors%1:14:00::) (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)
• S: (n) hum (hum%1:11:00::), humming (humming%1:11:00::) (a humming noise) "the hum of distant traffic"

Verb

• S: (v) hum (hum%2:32:00::) (sing with closed lips) "She hummed a melody"
• S: (v) hum (hum%2:42:00::), buzz (buzz%2:42:00::), seethe (seethe%2:42:00::) (be noisy with activity) "This office is buzzing with activity"
• S: (v) hum (hum%2:39:00::), thrum (thrum%2:39:01::) (sound with a monotonous hum)
• S: (v) hum (hum%2:32:01::) (make a low continuous sound) "The refrigerator is humming"