bet your bottom dollar
非常确信；非常相信某事
口语·表示绝对肯定
英文释义
to be absolutely certain or confident about something; to be willing to wager everything one has on a particular outcome
例句
You can bet your bottom dollar that she'll win the competition.
典故来源
与bet bottom dollar相同，强调用最后一点钱打赌，表示绝对自信。