fire alarm

  1. a signal to announce the outbreak of a fire, the activation of a smoke detector, etc.
  2. a bell, siren, whistle, flashing light, etc. to give this signal

See fire alarm in American Heritage Dictionary 4

noun
  1. A device, such as a siren, used in announcing the outbreak of a fire.
  2. The signal, especially the noise, produced by such a device.

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fire alarm

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