(intransitive) To make a low, continuous, humming or sibilant sound, like that made by bees with their wings.
(by extension) To utter a murmuring sound; to speak with a low, humming voice.
(chiefly of an insect) To fly while making such a sound.
(colloquial) To show a high level of activity and haste (alluding to the common simile "busy as a bee"). Often in the colloquial imperative "Buzz off!"
(transitive) To whisper; to communicate, as tales, in an undertone; to spread, as a report, by whispers or secretly.
