when pigs fly
Never, as in Sure he'll pay for the drinks—when pigs fly. Equating the flight of pigs with something impossible dates from the early 1600s, when several writers alleged that pigs fly with their tails forward. The idiom is also put as pigs may fly.
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But along with the cartoon funk is an all-too-real story of police brutality embodied by a horde of evil Pigs.‘Black Dynamite’ Presents Police Brutality: The Musical|Stereo Williams|January 9, 2015|DAILY BEAST
Andrew still plans to fly to Davos in Switzerland for the World Economic Forum on January 21, representing the British government.
After some animated debate at the conference, Lelaie declared, with some frustration, “If you push on the stick, you will fly.”Flight 8501 Poses Question: Are Modern Jets Too Automated to Fly?|Clive Irving|January 4, 2015|DAILY BEAST
Thus it attracted a wave of cowboy operators to fly passengers and cargo between cities.
Many of these are small operations that would never, in any case, fly beyond Indonesia.
You see Squinty, like most little pigs, thought more of something to eat than of anything else.
That was because he was hungry, you see, but pigs nearly always eat fast, as though they were continually in a hurry.
I can't tell how I drifted into pigs; much in the same way as you drifted into horses, I suppose.
You may take my word for it that pigs are far more interesting and far more respectable, though they're expensive, mind you.
Aristide darted off like a dragon-fly in the sunshine, as happy as a child with a new toy.The Joyous Adventures of Aristide Pujol|William J. Locke