n the state of being or appearing to be actively engaged in an activity
there is a constant hum of military preparation
n 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
n a humming noise
the hum of distant traffic
v sing with closed lips
She hummed a melody
v be noisy with activity
v sound with a monotonous hum
v make a low continuous sound
The refrigerator is humming