to make a continuous low humming sound like that of a bee
to be filled with the murmur of voices, or with gossip or rumours
Oil-industry publications buzz with talk of further cutbacks — The Times
to make a signal with a buzzer
to move in a hurried, energetic, or busy manner
to summon (somebody) or signal (somebody or something) with a buzzer
informal to telephone (somebody)
informal to fly over or close to (somebody or something) in order to threaten or warn (them)
The airliner was buzzed by fighters during its approach
[Middle English bussen, of imitative origin]