million to one

Having extremely low odds of happening or occurring. Typically hyphenated if used before a noun. They say they're working toward a solution, but with congress deadlocked the way they are, I reckon it's a million to one that they pass any legislation on the issue. I don't know why you waste your money playing the lottery. You've got a million-to-one chance of winning! A: "What do you think the chances are that we'll get a bonus this year?" B: "About a million to one."