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

        

    assure

     verb
    verb
    BrE BrE//əˈʃʊə(r)//
     
    , BrE//əˈʃɔː(r)//
     
    ; NAmE NAmE//əˈʃʊr//
     
    Verb Forms present simple I / you / we / they assure
    BrE BrE//əˈʃʊə(r)//
     
    , BrE//əˈʃɔː(r)//
     
    ; NAmE NAmE//əˈʃʊr//
     
    he / she / it assures
    BrE BrE//əˈʃʊəz//
     
    , BrE//əˈʃɔːz//
     
    ; NAmE NAmE//əˈʃʊrz//
     
    past simple assured
    BrE BrE//əˈʃʊəd//
     
    , BrE//əˈʃɔːd//
     
    ; NAmE NAmE//əˈʃʊrd//
     
    past participle assured
    BrE BrE//əˈʃʊəd//
     
    , BrE//əˈʃɔːd//
     
    ; NAmE NAmE//əˈʃʊrd//
     
    -ing form assuring
    BrE BrE//əˈʃʊərɪŋ//
     
    , BrE//əˈʃɔːrɪŋ//
     
    ; NAmE NAmE//əˈʃʊrɪŋ//
     
     
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  1. 1  to tell somebody that something is definitely true or is definitely going to happen, especially when they have doubts about it assure somebody (that)… You think I did it deliberately, but I assure you (that) I did not. We were assured that everything possible was being done. She's perfectly safe, I can assure you. assure somebody (of something) We assured him of our support. I won’t let you down, I can assure you of that. assure somebody + speech ‘He'll come back,’ Susan assured her.
  2. 2(formal) to make yourself certain about something assure yourself of something He assured himself of her safety. assure yourself that… She assured herself that the letter was still in the drawer.
  3. 3to make something certain to happen synonym guarantee assure something Victory would assure a place in the finals. assure somebody something Victory would assure them a place in the finals. This achievement has assured her a place in the history books.
  4. 4assure something (British English) to insure something, especially against somebody’s death What is the sum assured?
  5. Word Origin late Middle English: from Old French assurer, based on Latin ad- ‘to’ (expressing change) + securus, from se- ‘without’ + cura ‘care’.Extra examples Let me assure you that I will try to help you. We can assure you of our full support. ‘He’ll come back,’ Susan assured her. I know you think I did it deliberately, but I assure you (that) I did not. She’s perfectly safe, I can assure you. We assured him of our loyal support.Idioms (formal) used to emphasize that what you say is true or will definitely happen You may rest assured that we will do all we can to find him.
See the Oxford Advanced American Dictionary entry: assure