Definition of assure verb from the Oxford Advanced American Dictionary

        

    assure

     verb
    verb
    NAmE//əˈʃʊr//
     
    Verb Forms present simple I / you / we / they assure
     
    he / she / it assures
     
    past simple assured
     
    -ing form assuring
     
     
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  1. 1to tell someone 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 to 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.
  3. 3to 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.
  4. Idioms
    rest assured (that…)(formal)
     
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    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 Learner's Dictionary entry: assure