[Idiom] What does bet your bottom dollar mean?

[johnnygergieos]

Hi, UsingEnglish.

I just wanted to know what does "bet your bottom dollar" mean?

And please, can you give me an example.

Thank you.

 

[The Maltese Falcon]

It means that something is very certain, so certain that you could bet all your money on it, even the last dollar in your wallet--the one on the bottom, underneath all the other dollar bills.

 

[BobK]

Amazing what you find if you look hard enough: Bet your bottom dollar.

b