buzzer - definition and synonyms

noun [countable] 

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/ˈbʌzə(r)/
singularbuzzer
pluralbuzzers
  1. a small piece of equipment that buzzes when you press it, used mainly for getting someone’s attention

    Press the buzzer and speak into the intercom.

    1. a.
      used by players in a television or radio quiz programme to show that they know the answer to a question

      You have to be quick on the buzzer to win.