(informal) To behave in an unconventional or unrestrained manner; to exhibit the uninhibited side of one's personality.

plural of Fly River turtle

(baseball) A rule providing that a fair fly ball hit with a force play at third base, which is deemed catchable by an umpire, be ruled an out irrespective of the fielder's play, eliminating the force play at all bases.

(entomology) Any of the flies in the genera Lucilia and Phaenicia.

A type of fruit fly capable of wreaking extensive damage, Ceratitis capitata.

(idiomatic) to start quickly.

(idiomatic) Alternative form of pigs might fly

(idiomatic) A response (often with a hint of sarcasm) to a situation which one thinks that there is no chance of ever occurring.

(simile, sometimes sarcastic) to travel through the air with little or no benefit from aerodynamic lift

(informal) tularemia