Definition of alarm verb from the Oxford Advanced Learner's Dictionary

      

    alarm

     verb
    verb
    BrE BrE//əˈlɑːm//
     
    ; NAmE NAmE//əˈlɑːrm//
     
    Verb Forms present simple I / you / we / they alarm
    BrE BrE//əˈlɑːm//
     
    ; NAmE NAmE//əˈlɑːrm//
     
    he / she / it alarms
    BrE BrE//əˈlɑːmz//
     
    ; NAmE NAmE//əˈlɑːrmz//
     
    past simple alarmed
    BrE BrE//əˈlɑːmd//
     
    ; NAmE NAmE//əˈlɑːrmd//
     
    past participle alarmed
    BrE BrE//əˈlɑːmd//
     
    ; NAmE NAmE//əˈlɑːrmd//
     
    -ing form alarming
    BrE BrE//əˈlɑːmɪŋ//
     
    ; NAmE NAmE//əˈlɑːrmɪŋ//
     
    Fear
     
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  1. 1  alarm somebody to make somebody anxious or afraid synonym worry The captain knew there was an engine fault but didn't want to alarm the passengers. It alarms me that nobody takes this problem seriously. Synonymsfrightenscare alarm terrifyThese words all mean to make somebody afraid.frighten to make somebody feel afraid, often suddenly:He brought out a gun and frightened them off.scare to make somebody feel afraid:They managed to scare the bears away.alarm to make somebody anxious or afraid:It alarms me that nobody takes this problem seriously. Alarm is used when somebody 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 somebody feel extremely afraid:Flying terrified her.frighten or scare?Scare is slightly more informal than frighten.Patterns to frighten/​scare somebody/​something away/​off to frighten/​scare/​terrify somebody into doing something It frightens/​scares/​alarms/​terrifies me that… It frightens/​scares/​alarms/​terrifies me to think, see, etc. See related entries: Fear
  2. 2alarm something to fit something such as a door with a device that warns people when somebody is trying to enter illegally
  3. Word Origin late Middle English (as an exclamation meaning ‘to arms!’): from Old French alarme, from Italian allarme, from all' arme! ‘to arms!’.
See the Oxford Advanced American Dictionary entry: alarm