■ noun
1》 a low, continuous humming or murmuring sound, made by or similar to that made by an insect.
↘the sound of a ~er or telephone.
↘ informal a telephone call.
2》 an atmosphere of excitement and activity.
↘ informal a thrill.
3》 informal a rumour.
■ verb
1》 make a low, continuous humming sound.
↘signal with a ~er.
2》 move quickly.
↘( ~ off ) informal go away.
↘ informal (of an aircraft) fly very close to (something) at high speed.
3》 (often be ~ing with ) have an air of excitement or purposeful activity.
Origin
ME: imitative.