If she's here on time, I'll eat my hat!

她要是准时到这儿那才怪咧！

《牛津词典》

If he lies, I'll eat my hat!

如果他说谎，我把俺脑袋砍了！

youdao

I'll eat my hat.

我要吃掉我的帽子。

youdao

If Penn can make that happen, I will eat my hat.

FORBES: Can Mark Penn Fix Microsoft's Bing?

He said he told them "I will eat my hat if in five years' time" if the response times in Corby had dropped as a result of the plans.

BBC: MP Andy Sawford warns against ambulance station closures

STILL, IN spite of the government's continued diplomatic incompetence, there are reasons to think that Israel may emerge the perceived victor in the current campaign against Hamas (and I will be forced to eat my hat).

CENTERFORSECURITYPOLICY: Iran's Gaza diversion