be dollars to doughnuts that

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, to
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

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, to
Farlex Partner Idioms Dictionary © Farlex 2017
See also: