sure thing

something that is or is supposed to be a certain success, as a bet or a business venture: He thinks that real estate is a sure thing.
something assured; certainty: It's a sure thing that he'll refuse to cooperate.
surely; for sure; O.K.; roger (often used as an interjection).

1830–40, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sure thing
1.  chiefly (US) (sentence substitute) all right! yes indeed! used to express enthusiastic assent
2.  something guaranteed to be successful

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Idioms & Phrases

sure thing

  1. 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]

  2. Yes indeed, certainly, as in Are you coming tonight?Sure thing! This use of the idiom as an interjection dates from the late 1800s.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
That's not a sure thing, of course, so split at your own risk.
There is only one sure thing that will reduce or remove our human impact on the
Such a modest boost is nowhere near a sure thing, but researchers are hoping to
  use the new data to try other combinations.
Even some environmental benefits are not a sure thing.
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