| fly | (adjective) (British informal) not to be deceived or hoodwinked | - |
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| (noun) (baseball) a hit that flies up in the air | Synonyms: fly ball |
| (noun) two-winged insects characterized by active flight | - |
| (noun) an opening in a garment that is closed by a zipper or by buttons concealed under a fold of cloth | Synonyms: fly front |
| (noun) flap consisting of a piece of canvas that can be drawn back to provide entrance to a tent | Synonyms: fly sheet, rainfly, tent-fly, tent flap |
| (noun) fisherman's lure consisting of a fishhook decorated to look like an insect | - |
| (verb) decrease rapidly and disappear | Synonyms: vanish, vaporize |
| (verb) change quickly from one emotional state to another | - |
| (verb) transport by aeroplane | - |
| (verb) hit a fly | - |
| (verb) travel through the air; be airborne | Synonyms: wing |
| (verb) operate an airplane | Synonyms: aviate, pilot |
| (verb) move quickly or suddenly | - |
| (verb) run away quickly | Synonyms: flee, take flight |
| (verb) travel over (an area of land or sea) in an aircraft | - |
| (verb) travel in an airplane | - |
| (verb) pass away rapidly | Synonyms: fell, vanish |
| (verb) cause to fly or float | - |
| (verb) be dispersed or disseminated | - |
| (verb) display in the air or cause to float | - |
| flyaway | (adjective) guided by whim and fancy | Synonyms: flighty, head-in-the-clouds, scatterbrained |
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| (adjective) (of hair or clothing) worn loose | - |
| flyblown | (adjective) blemished, especially of reputation | - |
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| (adjective) foul and run-down and repulsive | Synonyms: sordid, squalid |
| (adjective) spoiled and covered with eggs and larvae of flies | Synonyms: maggoty |
| flybridge | (noun) the highest navigational bridge on a ship; a small (often open) deck above the pilot house | Synonyms: fly bridge, flying bridge, monkey bridge |
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| flycatcher | (noun) any of a large group of small songbirds that feed on insects taken on the wing | Synonyms: Old World flycatcher, true flycatcher |
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| (noun) large American birds that characteristically catch insects on the wing | Synonyms: New World flycatcher, tyrant bird, tyrant flycatcher |
| flyer | (noun) an advertisement (usually printed on a page or in a leaflet) intended for wide distribution | Synonyms: bill, broadsheet, broadside, circular, flier, handbill, throwaway |
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| (noun) someone who travels by air | Synonyms: flier |
| (noun) someone who operates an aircraft | Synonyms: aeronaut, aviator, flier |
| flyfish | (verb) fish with flies as lures | Synonyms: fly-fish |
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| flying | (adjective) hurried and brief | Synonyms: fast, quick |
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| (adjective) moving swiftly | Synonyms: fast-flying |
| (noun) an instance of traveling by air | Synonyms: flight |
| flyleaf | (noun) a blank leaf in the front or back of a book | - |
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| flyover | (noun) a flight at a low altitude (usually of military aircraft) over spectators on the ground | Synonyms: fly-by, flypast |
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| (noun) bridge formed by the upper level of a crossing of two highways at different levels | Synonyms: overpass |
| flypaper | (noun) paper that is poisoned or coated with a sticky substance to kill flies | - |
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| flypast | (noun) a flight at a low altitude (usually of military aircraft) over spectators on the ground | Synonyms: fly-by, flyover |
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| flyspeck | (adjective) very small | Synonyms: bantam, diminutive, lilliputian, midget, petite, tiny |
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| (noun) a tiny dark speck made by the excrement of a fly | - |
| flyswat | (noun) an implement with a flat part (of mesh or plastic) and a long handle; used to kill insects | Synonyms: flyswatter, swatter |
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| flyswatter | (noun) an implement with a flat part (of mesh or plastic) and a long handle; used to kill insects | Synonyms: flyswat, swatter |
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| flytrap | (noun) a trap for catching flies | - |
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| flyway | (noun) the geographic route along which birds customarily migrate | Synonyms: migration route |
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| flyweight | (noun) A weight class division in combat sports, often the lightest. | - |
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| (noun) an amateur boxer who weighs no more than 112 pounds | - |
| (noun) weighs no more than 115 pounds | - |
| flywheel | (noun) regulator consisting of a heavy wheel that stores kinetic energy and smooths the operation of a reciprocating engine | - |
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