a warning of danger, usually a loud noise or flashing light, a device that makes a loud noise or flashing light to warn of danger, a feeling of fear or worry that something unpleasant or dangerous might happen

sound the alarm, false alarm, raise the alarm

Formal and Informal Expressions of alarm

In different contexts, you can replace 'alarm' with suitable alternatives. In a more formal setting, 'warning' is apt. In informal speech or writing, 'heads-up, wake-up call' is a commonplace synonym.

alarm: Explore its Definition & Usage

alarm Definition

1a warning of danger, usually a loud noise or flashing light
2a device that makes a loud noise or flashing light to warn of danger
3a feeling of fear or worry that something unpleasant or dangerous might happen

Using alarm: Examples

Take a moment to familiarize yourself with how "alarm" can be used in various situations through the following examples!

Example
The alarm went off and woke me up.
Example
The fire alarm sounded and we all had to evacuate the building.
Example
I set my alarm for 6am so I can wake up early.
Example
The news caused great alarm among the public.
Example
The government issued an alarm about the potential dangers of the new virus.

alarm Synonyms and Antonyms

Synonyms for alarm

Phrases with alarm

sound the alarm
to give a warning of danger
Example
The security guard sounded the alarm when he saw the intruder.
false alarm
a warning of danger that turns out to be false or unnecessary
Example
The fire alarm was a false alarm and there was no fire.
raise the alarm
to alert others to a dangerous or urgent situation
Example
She raised the alarm when she saw smoke coming from the kitchen.

Origins of alarm

from Old French 'alarme', from Italian 'all'arme', meaning 'to arms'

📌

Summary: alarm in Brief

An 'alarm' [əˈlɑːm] is a warning of danger, usually a loud noise or flashing light, or a device that produces such a warning. It can also refer to a feeling of fear or worry about something unpleasant or dangerous. Examples include 'The alarm went off and woke me up,' and 'The government issued an alarm about the potential dangers of the new virus.' Phrases like 'sound the alarm' and 'raise the alarm' denote giving a warning of danger.