What is Alarm ?
Alarm is (noun) 1. a loud warning An alarm will sound if someone touches the wire. to raise the alarm to warn everyone of danger it was a false alarm it was a wrong warning 2. the fact or feeling of being afraid The expression on his face increased her alarm. There’s no cause for alarm, the injection won’t hurt at all. (verb) to frighten someone I don’t want to alarm you, but the police say a dangerous criminal has been seen in the village. Synonym worry. Antonym calm
source: Easier English, Student Dictionary Upper Intermediate Level