1. (

• busyness ,
• hum

) 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" ;

2. (

• Harkat-ul-Mujahidin ,
• HUM ,
• Harkat_ul-Ansar ,
• HUA ,
• Harkat_ul-Mujahedeen ,
• Al_Faran ,
• Movement_of_Holy_Warriors

) 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 ;

3. (

• hum ,
• humming

) a humming noise; "the hum of distant traffic" ;

1. (

• hum

) sing with closed lips; "She hummed a melody" ;

2. (

• hum ,
• buzz ,
• seethe

) be noisy with activity; "This office is buzzing with activity" ;

3. (

• hum ,
• thrum ,

) sound with a monotonous hum ;

4. (

• hum ,

) make a low continuous sound; "The refrigerator is humming" ;