Definition of buzzer noun from the Oxford Advanced Learner's Dictionary

 

buzzer

 noun
noun
BrE BrE//ˈbʌzə(r)//
 
; NAmE NAmE//ˈbʌzər//
 
Devices
 
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  • an electrical device that produces a buzzing sound as a signal Put your fingers on the buzzer and be ready to answer. The buzzer went off at eight o’clock. See related entries: Devices
  • Idioms (North American English) at the end of a game or period of play He missed a three-point attempt at the buzzer.
    See the Oxford Advanced American Dictionary entry: buzzer