Definition
Used to express absolute certainty that something will not occur, implying the speaker would face an absurd consequence if proven wrong.
我敢打赌，表示极为确信某事不会发生
If they actually win this match, I'll eat my hat.
如果他们真的赢了这场比赛，我就把我的帽子吃掉。
If he actually completes that project, I'll eat my hat!
如果他真的完成了那个项目，我就把我的帽子吃掉！
I'll eat my hat if she actually quits her job.
如果她真的辞职了，我就把我的帽子吃掉。