The definition of a sure thing is something definite, guaranteed or certain to happen.noun
An example of a sure thing is that a person will have to pay interest on credit card debt if he carries a balance and the card charges interest.YourDictionary definition and usage example. Copyright © 2013 by LoveToKnow Corp.
- something considered certain to win, succeed, etc.
- all right; OK: used interjectionally
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sure thing - Phrases/Idioms
a sure thing. A certainty, as in Making the bestseller list has been a sure thing for Stephen King. This usage originally alluded to a bet that one could not lose. [First half of 1800s]
Yes indeed, certainly, as in Are you coming tonight?—Sure thing! This use of the idiom as an interjection dates from the late 1800s.