sure bet
1. Something that is certain to occur. Based on his grades, it's a pretty sure bet that Harry won't be able to graduate on time.
2. A person or thing that is certain to be good or successful. Considering her high scoring average, she's a sure bet for the bowling team.
sure bet
and sure thinga certainty; something that is sure to take place. Of course, this land will become valuable in a few years. It's a sure thing!