noun

1. FLY, (baseball) a hit that flies up in the air
2. FLY, two-winged insects characterized by active flight
3. FLY, an opening in a garment that is closed by a zipper or by buttons concealed under a fold of cloth
4. FLY, fisherman's lure consisting of a fishhook decorated to look like an insect
5. FLY, flap consisting of a piece of canvas that can be drawn back to provide entrance to a tent

verb

1. FLY, decrease rapidly and disappear
2. FLY, change quickly from one emotional state to another
3. FLY, hit a fly
4. FLY, transport by aeroplane
5. FLY, be dispersed or disseminated
6. FLY, travel in an airplane
7. FLY, move quickly or suddenly
8. FLY, travel over (an area of land or sea) in an aircraft
9. FLY, cause to fly or float
10. FLY, travel through the air; be airborne
11. FLY, operate an airplane
12. FLY, pass away rapidly
13. FLY, run away quickly
14. FLY, display in the air or cause to float

adjective

1. FLY, (British informal) not to be deceived or hoodwinked