be dollars to doughnuts that (something happens)

be dollars to doughnuts that (something happens)

To be assured or certain to happen. (The idea is that one is so confident in a particular outcome that they would bet money against something less valuable). It's dollars to donuts that Kevin will be late tonight—he's never on time.
See also: dollar, doughnut, that

be dollars to doughnuts that

be a certainty that. North American informal
1936 James Curtis The Gilt Kid If he were seen it was dollars to doughnuts that he would be arrested.
See also: dollar, doughnut, that