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alarm

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verb [transitive] British English pronunciation: alarm /əˈlɑː(r)m/ 
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present tense
I/you/we/theyalarm
he/she/italarms
present participlealarming
past tensealarmed
past participlealarmed
  1. 1
    to make someone frightened or worried that something unpleasant or dangerous might happen

    I don't want to alarm you but I think there is a serious problem.

    School officials were alarmed by the number of children with the disease.

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