noun

• (zoology) Any insect of the order Diptera; characterized by having two wings (except for some wingless species), also called true flies.
  "Devils Lake is where I began my career as a limnologist in 1964, studying the lake’s neotenic salamanders and chironomids, or midge flies. […] The Devils Lake Basin is an endorheic, or closed, basin covering about 9,800 square kilometers in northeastern North Dakota."
• (non-technical) Especially, any of the insects of the family Muscidae, such as the common housefly (other families of Diptera include mosquitoes and midges).
  "When you're well enough off so's you don't have to fret about anything but your heft or your diseases you begin to get queer, I suppose. And the queerer the cure for those ailings the bigger the attraction. A place like the Right Livers' Rest was bound to draw freaks, same as molasses draws flies."
• (fishing) A lightweight fishing lure resembling an insect.
  "I went on trying for fish along the western bank down the river, but only small trout rose at my flies, and a score was the total catch."
• (weightlifting) A chest exercise performed by moving extended arms from the sides to in front of the chest. (also flye)

verb

• (intransitive) To travel through the air, another gas, or a vacuum, without being in contact with a grounded surface.
  "Birds of passage fly to warmer regions as it gets colder in winter."
• (ambitransitive, archaic, poetic) To flee, to escape (from).
  "Fly, my lord! The enemy are upon us!"
• (transitive, ergative) To cause to fly (travel or float in the air): to transport via air or the like.
  "Charles Lindbergh flew his airplane The Spirit of St. Louis across the Atlantic ocean."
• (intransitive) To travel or proceed very fast; to hasten.
  "He flew down the hill on his bicycle."

noun

• (obsolete) The action of flying; flight.
• (baseball) A fly ball.
• (American football) Ellipsis of fly route.
• (India, obsolete) The sloping or roof part of the canvas of a tent.
  "[T]he main part of the operation of pitching the tent, consisting of raising the flies, may be performed, and shelter afforded, without the walls, &c., being present."

verb

• (intransitive, baseball) To hit a fly ball; to hit a fly ball that is caught for an out. Compare ground (verb) and line (verb).
  "Jones flied to right in his last at-bat."