buzzer
n. countable B2 Upper Intermediate US //ˈbəzɝ// UK //bˈʌzɐ// buzzer
n. a device that makes a short, loud sound to signal that time is up or an action is finished. You hear it in sports, cooking timers, and game shows.
n. an electromechanical or electronic device that produces a sharp, audible tone to signal the end of a time period or the completion of a task.
The kitchen timer has a loud buzzer.
The referee blew the whistle and the buzzer sounded to end the match.
The sudden blare of the buzzer cut through the stadium's roar, signaling the final seconds of the championship game.
From buzz + -er.