plural alarms
1
a
: a device that makes a loud sound as a warning or signal
The alarm went off when he opened the door.
a car alarm
The whole town heard the alarm.
Note: In figurative usage, when alarm bells are ringing people are worried about a possible problem or danger.
b
: alarm clock
She set the alarm for six o'clock.
The alarm went off at six o'clock.
2
: a feeling of fear caused by a sudden sense of danger
The rumors caused widespread alarm and concern.
His parents have expressed alarm about/for his safety.
The new developments are being viewed with alarm.
She looked around in alarm when she heard the noise.
There's no cause for alarm. [=there is no reason to be worried or afraid]
3
: a warning of danger
The dog's barking gave the alarm and the intruders were caught.
A passerby saw the intruders and raised the alarm.
They have ignored repeated alarms about the dangers of smoking.
Economists have raised/sounded the alarm [=have warned people] about a possible recession.
Economists have been raising/sounding alarms about a possible recession.
alarms; alarmed; alarming
: to cause (someone) to feel a sense of danger : to worry or frighten (someone)
I didn't mean to alarm you.
The rapid spread of the disease has alarmed many people.
Cite this Entry
“Alarm.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/alarm. Accessed 10 Apr. 2026.
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