Longman Dictionary of Contemporary English homepage

fire alarm

 noun
     
Related topics: Household
fire alarm [countable]
TBBDH a 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.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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