fire alarm

noun3

1. •
   An electromechanical or electronic bell, klaxon, chime, horn, speaker, strobe light or other device which warns people in a building etc. of a possible fire or other condition requiring evacuation.

   • Should the automatic fire alarm sound, the gas from the [carbon dioxide] bottles may be released in the engine compartment by operating a pull handle in the driver's cab. — 1958
2. •
   The sound or other warning made by a fire alarm.
3. •
   An emergency response to a fire by the fire department with manpower and equipment.

   • A four fire-alarm fire ripped through a row of 2.5 story frame dwellings during the early morning hours