false alarm - meaning and definition. What is false alarm
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What (who) is false alarm - definition


false alarm         
(false alarms)
When you think something dangerous is about to happen, but then discover that you were mistaken, you can say that it was a false alarm.
...a bomb threat that turned out to be a false alarm.
N-COUNT
false alarm         
¦ noun a warning given about something that fails to happen.
False alarm         
A false alarm, also called a nuisance alarm, is the deceptive or erroneous report of an emergency, causing unnecessary panic and/or bringing resources (such as emergency services) to a place where they are not needed. False alarms may occur with residential burglary alarms, smoke detectors, industrial alarms, and in signal detection theory.

Wikipedia

False alarm
A false alarm, also called a nuisance alarm, is the deceptive or erroneous report of an emergency, causing unnecessary panic and/or bringing resources (such as emergency services) to a place where they are not needed. False alarms may occur with residential burglary alarms, smoke detectors, industrial alarms, and in signal detection theory.
Examples of use of false alarm
1. Many security officials later concluded that was a false alarm.
2. Even a false alarm over agroterrorism can prove costly.
3. "Let‘s hope it‘s all a false alarm," Louisiana Gov.
4. Firefighters later said the alert was a false alarm.
5. A police official at the fair said it had been a false alarm.