# bet one's bottom dollar

idiom

Source: https://englishreference.com/idiom/bet-ones-bottom-dollar
Updated: 2026-08-10

## Meaning

To be absolutely sure of something; to be certain enough of something to wager everything.

## Examples

- I would bet my bottom dollar that he arrives late.
- She knows her sister so well that she would bet her bottom dollar she is lying about the party.
- Given his consistent track record of success, I would bet my bottom dollar that his latest business venture will yield significant profits by the end of the year.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.