Real Dictionary

fly
countable noun: A fly is a small insect with two wings. There are many kinds of flies, and the most common are black in colour.
verb: If something such as your hair is flying about, it is moving about freely and loosely in the air.
verb: If you fly somewhere, you travel there in an aircraft.
verb: To fly someone or something somewhere means to take or send them there in an aircraft.
verb: When someone flies an aircraft, they control its movement in the air.
verb: When something such as a bird, insect, or aircraft flies, it moves through the air.

Fly in American English
river in S New Guinea, flowing through Papua New Guinea into the Coral Sea: c. 650 mi (1,046 km)

fly in American English 1
to move through the air

fly in American English 2
any dipterous insect; esp., the housefly
noun: any of numerous two-winged insects of the order Diptera, esp. of the family Muscidae, as the common housefly

fly in American English 3
alert and knowing; sharp; quick
adjective: clever; keen; ingenious

fly in American Englishfor 11, 19 1
intransitive verb: to move through the air using wings
transitive verb: to make (something) float or move through the air

fly in British English 1
verb: (of birds, aircraft, etc) to move through the air in a controlled manner using aerodynamic forces

fly in British English 2
noun: any dipterous insect, esp the housefly, characterized by active flight

fly in British English 3
adjective: knowing and sharp; smart
noun