From Longman Dictionary of Contemporary Englishfire alarmˈfire aˌlarm ●●○ noun [countable] TBBDHa piece of equipment that makes a loud noise to warn people of a fire in a building We were in the middle of an exam when the fire alarm went off. Someone set off the fire alarm.
Examples from the Corpus
fire alarm• It sounds like a fire alarm and enters my ears like a keening mosquito that I can not reach.• He was already in bed when he heard the hotel fire alarm go off.• He came up with the electric clock, a form of fire alarm, a railway signal and a loudspeaker.• Sounding of fire alarm. 2.• The entire house lights up when a burglar or fire alarm is triggered.• In the middle of the night, the fire alarm sounds, and we awaken.• The fire alarm went off that evening - Tuesday, November 24.fire alarm went off• The fire alarm went off that evening - Tuesday, November 24. 