| flip-flop |
reversal: a decision to reverse an earlier decision a backless sandal held to the foot by a thong between the big toe and the second toe an electronic circuit that can assume either of two stable states interchange: reverse (a direction, attitude, or course of action) a backward somersault
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| flittering scotoma |
scintillating scotoma: a localized area of diminished vision edged by shimmering colored lights; in many people it indicates the onset of migraine
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| fluid |
subject to change; variable; "a fluid situation fraught with uncertainty"; "everything was unstable following the coup" characteristic of a fluid; capable of flowing and easily changing shape fluent: smooth and unconstrained in movement; "a long, smooth stride"; "the fluid motion of a cat"; "the liquid grace of a ballerina" a substance that is fluid at room temperature and pressure in cash or easily convertible to cash; "liquid (or fluid) assets" a continuous amorphous substance that tends to flow and to conform to the outline of its container: a liquid or a gas affording change (especially in social status); "Britain is not a truly fluid society"; "upwardly mobile"
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| flat |
having a surface without slope, tilt in which no part is higher or lower than another; "a flat desk"; "acres of level farmland"; "a plane surface"; "skirts sewn with fine flat seams" having a relatively broad surface in relation to depth or thickness; "flat computer monitors" categoric: not modified or restricted by reservations; "a categorical denial"; "a flat refusal" stretched out and lying at full length along the ground; "found himself lying flat on the floor" lacking contrast or shading between tones lowered in pitch by one chromatic semitone; "B flat" compressed: flattened laterally along the whole length (e.g., certain leafstalks or flatfishes) bland: lacking taste or flavor or tang; "a bland diet"; "insipid hospital food"; "flavorless supermarket tomatoes"; "vapid beer"; "vapid tea" bland: lacking stimulating characteristics; uninteresting; "a bland little drama"; "a flat joke" having lost effervescence; "flat beer"; "a flat cola" a level tract of land; "the salt flats of Utah" (of taxes) not increasing as the amount taxed increases a shallow box in which seedlings are started sounded or spoken in a tone unvarying in pitch; "the owl's faint monotonous hooting" a musical notation indicating one half step lower than the note named horizontally level; "a flat roof" two-dimensional: lacking the expected range or depth; not designed to give an illusion or depth; "a film with two-dimensional characters"; "a flat two-dimensional painting" flatcar: freight car without permanent sides or roof a deflated pneumatic tire (of a tire) completely or partially deflated scenery consisting of a wooden frame covered with painted canvas; part of a stage setting with flat sails; "sail flat against the wind" not reflecting light; not glossy; "flat wall paint"; "a photograph with a matte finish" apartment: a suite of rooms usually on one floor of an apartment house commercially inactive; "flat sales for the month"; "prices remained flat"; "a flat market" directly: in a forthright manner; candidly or frankly; "he didn't answer directly"; "told me straight out"; "came out flat for less work and more pay"
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| fly |
travel through the air; be airborne; "Man cannot fly" move quickly or suddenly; "He flew about the place" fly a plane transport by aeroplane; "We fly flowers from the Caribbean to North America" cause to fly or float; "fly a kite" be dispersed or disseminated; "Rumors and accusations are flying" change quickly from one emotional state to another; "fly into a rage" pass away rapidly; "Time flies like an arrow"; "Time fleeing beneath him" travel in an airplane; "she is flying to Cincinnati tonight"; "Are we driving or flying?" two-winged insects characterized by active flight display in the air or cause to float; "fly a kite"; "All nations fly their flags in front of the U.N." flee: run away quickly; "He threw down his gun and fled" tent-fly: flap consisting of a piece of canvas that can be drawn back to provide entrance to a tent an opening in a garment that is closed by a zipper or by buttons concealed under a fold of cloth travel over (an area of land or sea) in an aircraft; "Lindbergh was the first to fly the Atlantic" (baseball) a hit that flies up in the air hit a fly fisherman's lure consisting of a fishhook decorated to look like an insect vanish: decrease rapidly and disappear; "the money vanished in las Vegas"; "all my stock assets have vaporized" (British informal) not to be deceived or hoodwinked
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