hum

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

a humming noise

“the hum of distant traffic”

sound with a monotonous hum

be noisy with activity

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

“there is a constant hum of military preparation”

make a low continuous sound

“The refrigerator is humming”

sing with closed lips

“She hummed a melody”