I'll eat my hat Meaning in the Cambridge English Dictionary
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Meaning of “I'll eat my hat” in the English Dictionary

"I'll eat my hat" in British English

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I'll eat my hat

old-fashioned used to say that you are ​sure something will not ​happen: If she ​actuallymarries him I'll eat my ​hat.
(Definition of I'll eat my hat from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)