eat (one's) hat

eat (one's) hat

A humorous action that one will allegedly take if something very unlikely happens. Kevin is always late, so if he actually shows up on time, I'll eat my hat.
See also: eat, hat
Farlex Dictionary of Idioms.

eat one's hat

Fig. a phrase telling the kind of thing that one would do if a very unlikely event really happens. If we get there on time, I'll eat my hat. I'll eat my hat if you get a raise. He said he'd eat his hat if she got elected.
See also: eat, hat
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

eat one's hat

Declare one's certainty that something will not happen or is untrue. This hyperbolic expression almost always follows an if-clause, as in If he's on time, I'll eat my hat, that is, "I'll consume my headgear if I'm wrong." Charles Dickens used it in Pickwick Papers (1837): "If I knew as little of life as that, I'd eat my hat and swallow the buckle whole." [First half of 1800s]
See also: eat, hat
The American Heritage® Dictionary of Idioms by Christine Ammer.

eat your hat

mainly BRITISH, OLD-FASHIONED
If you say that you will eat your hat if a particular thing happens, you mean that you do not believe that it will happen. I will eat my hat if the Social Democrats get in at the next general election. He has promised to eat his hat if he is wrong.
See also: eat, hat
Collins COBUILD Idioms Dictionary, 3rd ed.

I’ll eat my ˈhat!

(spoken) used to say that you think something is very unlikely to happen: They’re always late — if they get here before eight o’clock, I’ll eat my hat.
See also: eat
Farlex Partner Idioms Dictionary

eat one’s hat

tv. to do something extraordinary. (Always with if.) I’ll eat my hat if our advertisement actually brings us a president.
See also: eat, hat
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • see the funny side (of something)
  • see the funny side of something
  • sliced bread
  • the best thing since sliced bread
  • greatest thing since indoor plumbing
  • greatest thing since sliced bread
  • greatest thing since sliced bread, the
  • indoor
  • meals rejected by Ethiopians
  • reject