hum
hum
verb
To make a low, continuous, vibrating sound with the voice or an object.
"She began to hum a cheerful tune."
noun
A low, continuous, vibrating sound, often from an engine or voice.
"We heard the gentle hum of the engine."
Thesaurus
Synonyms: buzz, seethe, thrum, Harkat ul-Mujahedeen, Al Faran, Harkat-ul-Mujahidin, Harkat ul-Ansar, HUA, Movement of Holy Warriors, Harkat-ul-Mujahideen, busyness, humming