Definition of when pigs fly
- The train station will be renovated when pigs fly.
: to move in or pass through the air with wings
: to move through the air or before the wind or through outer space
: to float, wave, or soar in the air
: the action or process of flying : flight
: a device consisting of two or more radial vanes capable of rotating on a spindle to act as a fan or to govern the speed of clockwork or very light machinery
: to hit a fly in baseball
: a winged insect
: any of a large order (Diptera) of winged or rarely wingless insects (such as the housefly, mosquito, or gnat) that have the anterior wings functional, the posterior wings reduced to halteres, and segmented often headless, eyeless, and legless larvae — compare maggot
: a large stout-bodied fly
: keen, artful
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