a device that warns people of a particular danger, or that a particular person is in danger
زنگ خطر, آژیر, هشدار دهنده, زنگ هشدار, اعلام خطر, آژیر خطر
a burglar/fire/smoke alarm
The cat set off the alarm.
A car alarm went off in the middle of the night .
Carry a personal alarm with you.
Install an alarm system and learn how to use it.
see also burglar alarm, fire alarm, smoke alarm