fire alarm 
noun
A device making a loud noise that gives warning of a fire: a fire alarm went off and the building had to be evacuated...
- This time the ringing noise wasn't the fire alarm, but the dinner bell.
- That was when the idiots decided to test the fire alarm without the usual warning over the speakers.
- One girl bolted to the fire alarm and pulled it, setting the siren wailing and then sprinting for the door.
- radappertization
- radappertize
- radappertized
- radar
- Radar Alley
- radar astronomy
- radar beacon
- radar equation
- radar eye
- radar fence
- radar gun
- radar man
- radar map
- radar mapping
- radar net
- radar picket
- radar plotter
- radar scanner
- radarscope
- radar screen
- radar sonde
- radar speed check
- radar speed trap
- radar-track
- radar trap