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Buzzer (Noun)

A push button at an outer door that gives a ringing or buzzing signal when pushed.

Nouns denoting man-made objects.

A signaling device that makes a buzzing sound.

Nouns denoting man-made objects.

The doorbell's broken so we have to listen for the buzzer from the intercom to know when someone's at the door.
The scoreboard's buzzer sounded after the basketball player sank the winning shot at the last second.
In the quiz competition, each team had a buzzer to ring when they thought they knew the answer to the question.
The cook set the kitchen timer's buzzer to go off when the cake was done baking.
The telephone's buzzer got progressively louder and more insistent until the receptionist finally picked up the call.