It may have originated from a 17th century proverb, “pigs fly in the air with their tails forward” [1].
Examples
“In fact, pigs might fly the day Mario Kart Deluxe 8 slips beneath the £35 mark.”
“So much for Coventry wanting to become the Sporting City of Europe — pigs might fly!”
“It’s a concept that has no doubt raised the eyebrows of some of the old guard who think ‘pigs will fly’ before there would be a local market for NT beef.”
[1] “pigs” in The Oxford Dictionary of Phrase and Fable. Oxford University Press, 2005.
Photo credit: Brad Smith (Creative Commons)
Updated Sunday 08 March 20
Photo credit: Brad Smith (Creative Commons)
Updated Sunday 08 March 20
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