the chances of something happeningthe odds of doing something: The odds of getting hit by a falling satellite are very small.
(the) odds are (that) (=it is likely that): The odds are they won’t succeed.
the odds are in favour of something/(stacked) against something (=it is likely/unlikely to happen): The odds were always in favour of a South African victory.
the odds are in someone’s favour/(stacked) against someone (=they are likely/unlikely to succeed): The odds were stacked against him, but he never gave up.
What are the odds...?: What are the odds Jim will show up this time?