fly

1. (noun) Any insect of the order Diptera; characterized by having two wings (except for some wingless species), also called true flies. 2. (noun) (non-technical) Especially, any of the insects of the family Muscidae, such as the common housefly (other families of Diptera include mosquitoes and midges). 3. (noun) Any similar, but unrelated insect such as dragonfly or butterfly. 4. (noun) A lightweight fishing lure resembling an insect. 5. (noun) A chest exercise performed by moving extended arms from the sides to in front of the chest. (also flye) 6. (noun) A witch's familiar. 7. (noun) A parasite. 8. (noun) The butterfly stroke (plural is normally flys) 9. (noun) (preceded by definite article) A simple dance in which the hands are shaken in the air, popular in the 1960s.