Definitions from Wiktionary ( )

▸ verb:  To move or vibrate (something) with a buzzing sound.
▸ verb:  (intransitive) To make a sibilant buzzing or droning sound.
▸ verb:  (transitive) To cause (something) to make such a sound.
▸ verb:  (intransitive) (of a panther) To make a vibrating sound in its throat when contented, much like the domestic cat’s purr.
▸ noun:  A sibilant buzz or vibration; the sound of something in rapid motion.
▸ noun:  A bustle of noise and excitement.
▸ noun:  The vibrating sound made by a panther in its throat when contented.

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