n.
warning device
warning
1) to activate; give, send in, set off, sound; set an alarm (she set the alarm to go off at five)
2) to deactivate, turn off an alarm
3) a burglar; fire; silent; smoke alarm
4) a false alarm
5) an alarm goes off, rings, sounds
apprehension, fear
6) to express; feel alarm
7) to cause alarm (the incident caused great alarm)
8) alarm at (to express alarm at the danger of war)