Definition of sure adverb from the Oxford Advanced American Dictionary

     

    sure

     adverb
    adverb
    NAmE//ʃʊr//
     
    , NAmE//ʃər//
     
    (informal)
     
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  1. 1used to say “yes” to someone “Will you open the wine?” “Sure, where is it?” Did it hurt? Sure it hurt. Sure, no problem.
  2. 2used to emphasize something that you are saying Boy, it sure is hot. “Amazing view.” “Sure is.” That song sure as hell sounds familiar. He sure looked unhappy.
  3. 3used to reply to someone who has just thanked you for something “Thanks for the ride.” “Sure—anytime.”
  4. Idioms
    sure enough
     
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    used to say that something happened as expected I said he'd forget, and sure enough he did. “Stop,” she said, “I can hear something.” Sure enough, in the distance we could hear the sound of a car approaching.
See the Oxford Advanced Learner's Dictionary entry: sure