Definition of sure adverb from the Oxford Advanced Learner's Dictionary



    BrE BrE//ʃʊə(r)//
    , BrE//ʃɔː(r)//
    ; NAmE NAmE//ʃʊr//
    (informal, especially North American English)
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  1. 1  used to say ‘yes’ to somebody ‘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 somebody who has just thanked you for something ‘Thanks for the ride.’ ‘Sure—anytime.’
  4. Word OriginMiddle English: from Old French sur, from Latin securus ‘free from care’.Idioms
    (as) sure as eggs is eggs
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    (old-fashioned, British English, informal) used to say that something is definitely true
    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 American Dictionary entry: sure