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From Longman Dictionary of Contemporary English
Related topics: Daily life, Technology
buzzerbuzz‧er /ˈbʌzə $ -ər/ noun [countable]  DTa small thing, usually shaped like a button, that buzzes when you press it Press the buzzer if you know the answer.
Examples from the Corpus
buzzerIn the vestibule, I scanned the column of buzzers while she fumbled in her purse for her keys.They went into the lobby where the doorman, inordinately well-dressed to be pushing buzzers, gave I0C a sharp blast.Each game she questions her ability anew, as if the starting buzzer erased all her past accomplishments.Finally they rang the bell of the Frasers' flat, and after a moment the buzzer went.I gingerly pressed the buzzer, embarrassed.When the buzzer on the wall sounded she jumped, striking a wrong key.When the buzzer went on his new chrome and ash desk, he jumped.The buzzer sounded for the end of the quarter.The buzzer on his intercom interrupted his thoughts.
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