bet you dollars to doughnuts
I assure you (that something will happen, with so much confidence that I would bet money against something less valuable). I lost my umbrella, so I bet you dollars to doughnuts that it rains tomorrow! Oh, I bet you dollars to doughnuts that Kevin will be late tonight—he's never on time! Well, we know the rest of the family has gotten to town, so if Mom's calling you repeatedly, I'd bet you dollars to doughnuts they're making her miserable.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.