Fly Fly (fl[imac]), v. i. [imp. Flew (fl[=u]); p. p. Flown (fl[=o]n); p. pr. & vb. n. Flying.] [OE. fleen, fleen, fleyen, flegen, AS. fle['o]gan; akin to D. vliegen, OHG. fliogan, G. fliegen, Icel. flj[=u]ga, Sw. flyga, Dan. flyve, Goth. us-flaugjan to cause to fly away, blow about, and perh. to L. pluma feather, E. plume. [root]84. Cf. Fledge, Flight, Flock of animals.] 1. To move in or pass thorugh the air with wings, as a bird. 2. To move through the air or before the wind; esp., to pass or be driven rapidly through the air by any impulse. 3. To float, wave, or rise in the air, as sparks or a flag. Man is born unto trouble, as the sparks fly upward. --Job v. 7. 4. To move or pass swiftly; to hasten away; to circulate rapidly; as, a ship flies on the deep; a top flies around; rumor flies. Fly, envious Time, till thou run out thy race. --Milton. The dark waves murmured as the ships flew on. --Bryant. 5. To run from danger; to attempt to escape; to flee; as, an enemy or a coward flies. See Note under Flee. Fly, ere evil intercept thy flight. --Milton. Whither shall I fly to escape their hands ? --Shak. 6. To move suddenly, or with violence; to do an act suddenly or swiftly; -- usually with a qualifying word; as, a door flies open; a bomb flies apart. To fly about (Naut.), to change frequently in a short time; -- said of the wind. To fly around, to move about in haste. [Colloq.] To fly at, to spring toward; to rush on; to attack suddenly. To fly in the face of, to insult; to assail; to set at defiance; to oppose with violence; to act in direct opposition to; to resist. To fly off, to separate, or become detached suddenly; to revolt. To fly on, to attack. To fly open, to open suddenly, or with violence. To fly out. (a) To rush out. (b) To burst into a passion; to break out into license. To let fly. (a) To throw or drive with violence; to discharge. ``A man lets fly his arrow without taking any aim.'' --Addison. (b) (Naut.) To let go suddenly and entirely; as, to let fly the sheets.