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.
The loud sound of the fire alarm prompted everyone to evacuate the building.
Regular fire drills help ensure that people respond quickly to the fire alarm.
The modern fire alarm system is equipped with sensors to detect smoke and heat.
The fire alarm went off, signaling an emergency situation that required immediate attention.
