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English definition of “alarm”

alarm

noun (WARNING)    /əˈlɑːm/ US  /-lɑːrm/
[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.Threats and warnings B1 [C] a device that makes a loud noise to warn of danger: a burglar/car/fire/smoke alarmThreats and warnings A2 [C] an alarm clockWatches and clocks 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.Watches and clocks
(Definition of alarm noun (WARNING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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