| fly | (noun) (baseball) a hit that flies up in the air | Synonyms: fly ball |
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| (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 | - |
| 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 |
| flying | (noun) an instance of traveling by air | Synonyms: flight |
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| 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 | (noun) a tiny dark speck made by the excrement of a fly | - |
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| 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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