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

      

    arm

     verb
    verb
    BrE BrE//ɑːm//
     
    ; NAmE NAmE//ɑːrm//
     
    Verb Forms present simple I / you / we / they arm
    BrE BrE//ɑːm//
     
    ; NAmE NAmE//ɑːrm//
     
    he / she / it arms
    BrE BrE//ɑːmz//
     
    ; NAmE NAmE//ɑːrmz//
     
    past simple armed
    BrE BrE//ɑːmd//
     
    ; NAmE NAmE//ɑːrmd//
     
    past participle armed
    BrE BrE//ɑːmd//
     
    ; NAmE NAmE//ɑːrmd//
     
    -ing form arming
    BrE BrE//ˈɑːmɪŋ//
     
    ; NAmE NAmE//ˈɑːrmɪŋ//
     
     
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  1. 1  [intransitive, transitive] to provide weapons for yourself/somebody in order to fight a battle or a war The country was arming against the enemy. arm yourself/somebody (with something) The men armed themselves with sticks and stones. (figurative) She had armed herself for the meeting with all the latest statistics. see also armed
  2. 2[transitive] arm something to make a bomb, etc. ready to explode compare disarm see also armed
  3. Word Originverb Middle English: from Old French armer (verb), from Latin armare, from arma ‘armour, arms’.
See the Oxford Advanced American Dictionary entry: arm