List of idioms of improbability

Look up when pigs fly in Wiktionary, the free dictionary.

There are many idioms of improbability, used to denote that something is impossible or unlikely to occur.

In English

Flying pig
A flying pig is a symbol of an impossible event coming to pass. The popular saying "[it will happen] when pigs fly" (or when pigs have wings) is traditionally used to mean that the specified event will never occur.
Cold hell 
Rises from the general belief that hell is an extremely hot place. Expressions include "When hell freezes over", "A cold day in hell", "Satan will be ice-skating to work", and "A snowball's chance in hell".
If wishes were horses, beggars would ride
Once in a blue moon
Twelfth of Never

In other languages

This list is incomplete; you can help by expanding it.

See also

References

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