Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “alarm”

alarm

noun uk   /əˈlɑːm/ us    /-lɑːrm/

alarm noun (WARNING)

[C] a warning of danger, usually a loud noise or flashing light: If there's any trouble, raise/sound the alarm by pulling the emergency cord. The first two bomb alerts were false alarms, but the third was for real. B1 [C] a device that makes a loud noise to warn of danger: a burglar/car/fire/smoke alarm A2 [C] an alarm clock B1 [C] If an electronic device such as a watch or computer has an alarm, it can be set to make a noise at a particular time.

alarm noun (WORRY)

C2 [U] sudden worry and fear, especially that something dangerous or unpleasant might happen: I didn't tell her that he was late because I didn't want to cause her any alarm. Villagers have reacted with alarm to news of a proposed new road.

alarm

verb [T] uk   /əˈlɑːm/ us    /-lɑːrm/
C1 to make someone worried or frightened: I didn't want to alarm him by telling him that she was ill.
(Definition of alarm from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of alarm?
Add Cambridge dictionaries to your browser to your website

Definitions of “alarm” in other dictionaries

Word of the Day

mutant

an organism that is different from others of its type because of a permanent change in its genes

Word of the Day

What’s that lovely smell?

by Kate Woodford,
October 29, 2014
As adult humans, we can distinguish about 10,000 different smells. It’s no wonder, then, that we have so many words and expressions to describe them. This week we’re taking a look at those smell words – words that describe good smells and words that describe bad smells. Most smell words are either

Read More 

high-frequency trading noun

October 27, 2014
a type of stock market trading that uses very complex technology to trade extremely quickly, often making tiny profits which nevertheless add up to substantial sums Lewis’s book, Flash Boys, is driving a huge amount of attention toward the topic of high frequency trading, and it has rekindled some of

Read More