Definition of alarm verb from the Oxford Advanced American Dictionary

     

    alarm

     verb
    verb
    NAmE//əˈlɑrm//
     
    Verb Forms present simple I / you / we / they alarm
     
    he / she / it alarms
     
    past simple alarmed
     
    -ing form alarming
     
     
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  1. 1alarm somebody (to do something) to make someone anxious or afraid synonym worry The captain knew there was an engine fault but didn't want to alarm the passengers. synonyms at scare
  2. 2 alarm something to put a device on something, such as a door, that warns people when someone is trying to enter illegally
  3. Thesaurusscarefrighten alarm terrifyThese words all mean to make someone afraid.scare to make someone feel afraid:They managed to scare away the bears.frighten to make someone feel afraid, often suddenly:She brought out a gun and frightened them off.scare or frighten?Frighten is slightly more formal than scare.alarm to make someone anxious or afraid:I am alarmed at how quickly this decision was made. Alarm is used when someone has a feeling that something unpleasant or dangerous might happen in the future; the feeling is often more one of worry than actual fear.terrify to make someone feel extremely afraid:Flying terrified her.Patterns to scare/frighten somebody/something away/off to scare/frighten/terrify somebody into doing something It scares/frightens/alarms/terrifies me >that…> It scares/frightens/alarms/terrifies me >to>think, see, etc.
See the Oxford Advanced Learner's Dictionary entry: alarm