alarm

US /əˈlɑ:rm/

UK /əˈlɑ:m/

A2
n.NounSound or light used for a warning or alert
Opening the emergency exit door will sound the alarm
v.t.Transitive VerbTo make someone unpleasantly surprised
Don’t alarm the passengers by saying there is problem with the plane’s engine
n.Nounan alarm clock
I got late to work because my alarm didn't go off.

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