alarm

noun1 of 2

sound or light used for a warning or to wake someone

• “It is not possible to switch off the smoke alarm.”Tatoeba
• “All the houses were shaking and alarms were ringing everywhere.”Tatoeba

Sentences from Tatoeba show real usage. A word can have several meanings, so a sentence may use another one.

verb2 of 2

To call to arms for defense