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English definition of “fire alarm”

fire alarm

noun [C]    
a device such as a bell or siren that warns the people in a building that the building is on fire: If the fire alarm goes off (= starts making a sound), leave the building calmly.Fire serviceFire and flameElectrical switches and connections
(Definition of fire alarm noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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