bet bottom dollar

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bet your bottom dollar

Be certain that something will happen (so much so that one would hypothetically risk one's last dollar betting on it). I lost my umbrella, so you can bet your bottom dollar that it will rain tomorrow! Oh, you can bet your bottom dollar that Kevin will be late tonight—he's never on time!
See also: bet, bottom, dollar

bet one's bottom dollar

 and bet one's life
Fig. to be quite certain (about something). (A bottom dollar is the last dollar.) I'll be there. You bet your bottom dollar. I bet my bottom dollar you can't swim across the pool. You bet your life I can't swim that far.
See also: bet, bottom, dollar
References in periodicals archive ?
I bet life was just fun and exciting back then and you think that if you see him or get back with him then life will be like that again.
However, I'll bet life at the Wright family home this week took on a little extra significance
I bet life wasn't much fun for a long time and all the doubters were probably whispering in her ear: "Forget the wizard.