you can bet your bottom dollar

US /ju kæn bɛt jʊər ˈbɑtəm ˈdɑlər/
UK /ju kæn bɛt jʊər ˈbɑtəm ˈdɑlər/
"you can bet your bottom dollar" picture
1.

間違いない, 確実だ

to be absolutely certain about something; to be sure that something will happen

:
You can bet your bottom dollar that he'll be late.
彼が遅れるのは間違いない
If she says she'll do it, you can bet your bottom dollar it'll get done.
彼女がやると言ったら、間違いなくそれは実行されるだろう。