hummed
hummed
verb
Produced a low, continuous, musical sound with closed lips, often a melody.
"She hummed a cheerful tune while she worked."
Thesaurus
Synonyms: buzz, seethe, hum, thrum, Harkat ul-Mujahedeen, Al Faran, Harkat-ul-Mujahidin, Harkat ul-Ansar, HUA, Movement of Holy Warriors, Harkat-ul-Mujahideen, busyness