odds-on

Related to odds-on: Odds ratio

odds-on

1. Very likely or probable. Judging by the FBI's activity around the building, it seemed odds-on that an arrest would be made soon. It's odds-on at this point that we'll have to liquidate the company.
2. Most favored to win in a race. (Used almost exclusively in the phrase "odds-on favorite.") As usual, Man o' War is the odds-on favorite to win. I'd say no other horse really stands a chance. Who do you think is the odds-on favorite to win the World Cup?
Farlex Dictionary of Idioms.

odds-on

mod. having to do with the thing or person favored to win. My horse is an odds-on favorite to win.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • against all odds
  • against the odds
  • at odds over (something)
  • at odds
  • odds
  • by all odds
  • be at odds
  • be at odds (with)
  • ask no odds
  • set at odds