(v): change location; move, travel, or proceed, also metaphorically
(v): move quickly or suddenly
(v): move so as to change position, perform a nontranslational motion
(v): operate an airplane
(v): handle and cause to function
(v): transport by aeroplane
(v): move while supporting, either in a vehicle or in one's hands or on one's body
(v): cause to fly or float
(v): be dispersed or disseminated
(v): change location; move, travel, or proceed, also metaphorically
(v): change quickly from one emotional state to another
(v): undergo a change; become different in essence; losing one's or its original nature
(v): pass away rapidly
(v): pass by
(v): travel in an airplane
(v): undergo transportation as in a vehicle
(v): display in the air or cause to float
(v): make visible or noticeable
(v): run away quickly
(v): flee; take to one's heels; cut and run
(v): travel over (an area of land or sea) in an aircraft
(v): travel upon or across
(v): hit a fly
(v): cause to move by striking
(v): decrease rapidly and disappear
(v): decrease in size, extent, or range
(n): two-winged insects characterized by active flight
(n): insects having usually a single pair of functional wings (anterior pair) with the posterior pair reduced to small knobbed structures and mouth parts adapted for sucking or lapping or piercing
(n): flap consisting of a piece of canvas that can be drawn back to provide entrance to a tent
(n): any broad thin and limber covering attached at one edge; hangs loose or projects freely
(n): an opening in a garment that is closed by a zipper or by buttons concealed under a fold of cloth
(n): a vacant or unobstructed space that is man-made
(n): (baseball) a hit that flies up in the air
(n): the act of contacting one thing with another
(n): fisherman's lure consisting of a fishhook decorated to look like an insect
(n): (angling) any bright artificial bait consisting of plastic or metal mounted with hooks and trimmed with feathers
(adj): (British informal) not to be deceived or hoodwinked
(adj): vs. unalert), watchful -- (engaged in or accustomed to close observation
"The most vociferous of the invaders of the Doral were probably no more than self-seekers and stoned demagogues, but there were more perilous infiltrations into the ranks of the non-delegates. The Yippies smelled a grand jury and more conspiracy trials in the offing and clammed up, but the vets, the most persuasive antiwar group in the country, were not so fly."
- 'The Big Tease', Germaine Greer in Harper's Monthly Magazine, Oct 1972.
In an odd way, that sounds lovely.
In medical intensive care units, to fly means to be able to withstand removal of a breathng tube more or less permanently. I.e., "Ms Bucket just t-pieced for three hours and her lungs sound clear, should we extubate?" "Yeah, I think she'll fly."