I'll eat my hat

成語所屬單字hat

I'll eat my hat — 慣用語

1. used to say that you are absolutely certain something will not happen.

1.慣用語
釋義

…的話我名字倒著寫（表示堅信某事絕不會發生）

used to say that you are absolutely certain something will not happen.

例句

If the train arrives on time today, I'll eat my hat.

Chen says he'll finish the project by Friday, but I'll eat my hat if he does.