| flabbergast | (verb) overcome with amazement | Synonyms: boggle, bowl over |
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| flag | (verb) provide with a flag | - |
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| (verb) become less intense | Synonyms: ease off, ease up, slacken off |
| (verb) communicate or signal with a flag | - |
| (verb) decorate with flags | - |
| (verb) droop, sink, or settle from or as if from pressure or loss of tautness | Synonyms: droop, sag, swag |
| flagellate | (verb) whip | Synonyms: scourge |
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| flail | (verb) give a thrashing to; beat hard | Synonyms: lam, thrash, thresh |
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| (verb) move like a flail; thresh about | Synonyms: thresh |
| flake | (verb) come off in flakes or thin small pieces | Synonyms: flake off, peel, peel off |
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| (verb) cover with flakes or as if with flakes | - |
| (verb) form into flakes | - |
| flambe | (verb) pour liquor over and ignite (a dish) | - |
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| flame | (verb) criticize harshly, usually via an electronic medium | - |
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| (verb) be in flames or aflame | - |
| (verb) shine with a sudden light | Synonyms: flare |
| flank | (verb) be located at the sides of something or somebody | - |
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| flap | (verb) pronounce with a flap, of alveolar sounds | - |
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| (verb) make a fuss; be agitated | Synonyms: dither, pother |
| (verb) to flutter noisily when moved by the wind | - |
| (verb) move in a wavy pattern or with a rising and falling motion | Synonyms: roll, undulate, wave |
| (verb) move with a flapping motion | Synonyms: beat |
| (verb) move with a thrashing motion | Synonyms: beat |
| flare | (verb) become flared and widen, usually at one end | Synonyms: flare out |
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| (verb) erupt or intensify suddenly | Synonyms: break open, burst out, erupt, flare up, irrupt |
| (verb) burn brightly | Synonyms: blaze up, burn up, flame up |
| (verb) shine with a sudden light | Synonyms: flame |
| flash | (verb) appear briefly | - |
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| (verb) emit a brief burst of light | - |
| (verb) make known or cause to appear with great speed | - |
| (verb) protect by covering with a thin sheet of metal | - |
| (verb) run or move very quickly or hastily | Synonyms: dart, dash, scoot, scud, shoot |
| (verb) gleam or glow intermittently | Synonyms: blink, twinkle, wink, winkle |
| (verb) display proudly; act ostentatiously or pretentiously | Synonyms: flaunt, ostentate, show off, swank |
| (verb) expose or show briefly | - |
| flatten | (verb) become flat or flatter | Synonyms: flatten out |
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| (verb) make flat or flatter | - |
| (verb) lower the pitch of (musical notes) | Synonyms: drop |
| flatter | (verb) praise somewhat dishonestly | Synonyms: blandish |
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| flaunt | (verb) display proudly; act ostentatiously or pretentiously | Synonyms: flash, ostentate, show off, swank |
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| flavor | (verb) lend flavor to | Synonyms: flavour, season |
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| flavour | (verb) lend flavor to | Synonyms: flavor, season |
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| flaw | (verb) add a flaw or blemish to; make imperfect or defective | Synonyms: blemish |
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| flay | (verb) strip the skin off | - |
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| fleck | (verb) make a spot or mark onto | Synonyms: blob, blot, spot |
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| fledge | (verb) grow feathers | Synonyms: feather |
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| (verb) decorate with feathers | Synonyms: flight |
| (verb) feed, care for, and rear young birds for flight | - |
| flee | (verb) run away quickly | Synonyms: fly, take flight |
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| fleece | (verb) shear the wool from | Synonyms: shear |
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| (verb) rip off; ask an unreasonable price | Synonyms: gazump, hook, overcharge, pluck, plume, rob, soak, surcharge |
| fleer | (verb) to smirk contemptuously | - |
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| fleet | (verb) disappear gradually | Synonyms: blow over, evanesce, fade, pass, pass off |
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| (verb) move along rapidly and lightly; skim or dart | Synonyms: dart, flit, flutter |
| flense | (verb) strip the blubber or skin from (a whale or seal) | - |
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| flesh | (verb) remove adhering flesh from (hides) when preparing leather manufacture | - |
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| flex | (verb) cause (an object) to assume a crooked or angular form | Synonyms: bend, deform, turn, twist |
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| (verb) bend a joint | Synonyms: bend |
| (verb) form a curve | Synonyms: bend |
| (verb) contract | - |
| (verb) exhibit the strength of | - |
| flick | (verb) remove with a flick (of the hand) | - |
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| (verb) touch or hit with a light, quick blow | - |
| (verb) cause to make a snapping sound | Synonyms: click, snap |
| (verb) throw or toss with a quick motion | Synonyms: jerk |
| (verb) twitch or flutter | Synonyms: riffle, ruffle |
| (verb) cause to move with a flick | Synonyms: flip |
| (verb) flash intermittently | Synonyms: flicker |
| (verb) look through a book or other written material | Synonyms: flip, leaf, riff, riffle, thumb |
| (verb) shine unsteadily | Synonyms: flicker |
| flicker | (verb) move back and forth very rapidly | Synonyms: flitter, flutter, quiver, waver |
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| (verb) flash intermittently | Synonyms: flick |
| (verb) shine unsteadily | Synonyms: flick |
| flight | (verb) decorate with feathers | Synonyms: fledge |
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| (verb) fly in a flock | - |
| (verb) shoot a bird in flight | - |
| flinch | (verb) draw back, as with fear or pain | Synonyms: cringe, funk, quail, recoil, shrink, squinch, wince |
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| fling | (verb) throw with force or recklessness | - |
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| (verb) move in an abrupt or headlong manner | - |
| (verb) indulge oneself | Synonyms: splurge |
| (verb) throw or cast away | Synonyms: cast aside, cast away, cast out, chuck out, discard, dispose, put away, throw away, throw out, toss, toss away, toss out |
| flip | (verb) reverse (a direction, attitude, or course of action) | Synonyms: alternate, flip-flop, interchange, switch, tack |
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| (verb) go mad, go crazy | Synonyms: flip out |
| (verb) react in an excited, delighted, or surprised way | Synonyms: flip out |
| (verb) throw or toss with a light motion | Synonyms: pitch, sky, toss |
| (verb) cause to go on or to be engaged or set in operation | Synonyms: switch, throw |
| (verb) turn upside down, or throw so as to reverse | Synonyms: flip over, turn over |
| (verb) move with a flick or light motion | - |
| (verb) lightly throw to see which side comes up | Synonyms: toss |
| (verb) cause to move with a flick | Synonyms: flick |
| (verb) toss with a sharp movement so as to cause to turn over in the air | Synonyms: twitch |
| (verb) look through a book or other written material | Synonyms: flick, leaf, riff, riffle, thumb |
| flirt | (verb) talk or behave amorously, without serious intentions | Synonyms: butterfly, chat up, coquet, coquette, dally, mash, philander, romance |
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| (verb) behave carelessly or indifferently | Synonyms: dally, play, toy |
| flit | (verb) move along rapidly and lightly; skim or dart | Synonyms: dart, fleet, flutter |
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| flitter | (verb) move back and forth very rapidly | Synonyms: flicker, flutter, quiver, waver |
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| float | (verb) convert from a fixed point notation to a floating point notation | - |
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| (verb) allow (currencies) to fluctuate | - |
| (verb) make the surface of level or smooth | - |
| (verb) put into the water | - |
| (verb) be in motion due to some air or water current | Synonyms: be adrift, blow, drift |
| (verb) be afloat either on or below a liquid surface and not sink to the bottom | Synonyms: swim |
| (verb) set afloat | - |
| (verb) move lightly, as if suspended | - |
| (verb) circulate or discuss tentatively; test the waters with | - |
| flocculate | (verb) form into an aggregated lumpy or fluffy mass | - |
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| (verb) cause to become a fluffy or lumpy aggregate | - |
| flock | (verb) come together as in a cluster or flock | Synonyms: clump, cluster, constellate |
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| (verb) move as a crowd or in a group | - |
| flog | (verb) beat severely with a whip or rod | Synonyms: lash, lather, slash, strap, trounce, welt, whip |
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| (verb) beat with a cane | Synonyms: cane, lambast, lambaste |
| flood | (verb) cover with liquid, usually water | - |
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| (verb) become filled to overflowing | - |
| (verb) fill quickly beyond capacity; as with a liquid | Synonyms: deluge, inundate, swamp |
| (verb) supply with an excess of | Synonyms: glut, oversupply |
| floodlight | (verb) illuminate with floodlights | - |
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| floor | (verb) knock down with force | Synonyms: coldcock, deck, dump, knock down |
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| (verb) surprise greatly; knock someone's socks off | Synonyms: ball over, blow out of the water, shock, take aback |
| flop | (verb) fall suddenly and abruptly | - |
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| (verb) fall loosely | - |
| (verb) fail utterly; collapse | Synonyms: fall flat, fall through, founder |
| floss | (verb) use dental floss to clean | - |
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| flounce | (verb) walk emphatically | - |
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| flounder | (verb) walk with great difficulty | Synonyms: stagger |
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| (verb) behave awkwardly; have difficulties | - |
| flour | (verb) convert grain into flour | - |
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| (verb) cover with flour | - |
| flourish | (verb) grow vigorously | Synonyms: boom, expand, thrive |
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| (verb) move or swing back and forth | Synonyms: brandish, wave |
| (verb) make steady progress; be at the high point in one's career or reach a high point in historical significance or importance | Synonyms: fly high, prosper, thrive |
| flout | (verb) laugh at with contempt and derision | Synonyms: barrack, gibe, jeer, scoff |
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| (verb) treat with contemptuous disregard | Synonyms: scoff |
| flow | (verb) undergo menstruation | Synonyms: menstruate |
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| (verb) cover or swamp with water | - |
| (verb) fall or flow in a certain way | Synonyms: fall, hang |
| (verb) move along, of liquids | Synonyms: course, feed, run |
| (verb) move or progress freely as if in a stream | Synonyms: flux |
| (verb) cause to flow | - |
| (verb) be abundantly present | - |
| flower | (verb) produce or yield flowers | Synonyms: bloom, blossom |
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| flub | (verb) make a mess of, destroy or ruin | Synonyms: ball up, blow, bobble, bodge, bollix, bollix up, bollocks, bollocks up, botch, botch up, bumble, bungle, fluff, foul up, fuck up, fumble, louse up, mess up, mishandle, muck up, muff, screw up, spoil |
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| fluctuate | (verb) be unstable | - |
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| (verb) move or sway in a rising and falling or wavelike pattern | Synonyms: vacillate, waver |
| (verb) cause to fluctuate or move in a wavelike pattern | - |
| fluff | (verb) ruffle (one's hair) by combing the ends towards the scalp, for a full effect | Synonyms: tease |
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| (verb) erect or fluff up | Synonyms: ruffle |
| (verb) make a mess of, destroy or ruin | Synonyms: ball up, blow, bobble, bodge, bollix, bollix up, bollocks, bollocks up, botch, botch up, bumble, bungle, flub, foul up, fuck up, fumble, louse up, mess up, mishandle, muck up, muff, screw up, spoil |
| flummox | (verb) be a mystery or bewildering to | Synonyms: amaze, baffle, beat, bewilder, dumbfound, get, gravel, mystify, nonplus, perplex, pose, puzzle, stick, stupefy, vex |
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| flump | (verb) set (something or oneself) down with or as if with a noise | Synonyms: plank, plonk, plop, plump, plump down, plunk, plunk down |
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| (verb) fall heavily | Synonyms: flump down |
| flunk | (verb) fail to get a passing grade | Synonyms: bomb, fail, flush it |
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| fluoresce | (verb) exhibit or undergo fluorescence | - |
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| fluoridate | (verb) subject to fluoridation; treat with fluoride | Synonyms: fluoridise, fluoridize |
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| fluoridise | (verb) subject to fluoridation; treat with fluoride | Synonyms: fluoridate, fluoridize |
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| fluoridize | (verb) subject to fluoridation; treat with fluoride | Synonyms: fluoridate, fluoridise |
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| flurry | (verb) cause to feel embarrassment | Synonyms: confuse, disconcert, put off |
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| (verb) move in an agitated or confused manner | - |
| flush | (verb) turn red, as if in embarrassment or shame | Synonyms: blush, crimson, redden |
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| (verb) cause to flow through something | - |
| (verb) rinse, clean, or empty with a liquid | Synonyms: purge, scour |
| (verb) irrigate with water from a sluice | Synonyms: sluice |
| (verb) cause to flow or flood with or as if with water | - |
| (verb) make level or straight | Synonyms: even, even out, level |
| (verb) glow or cause to glow with warm color or light | - |
| fluster | (verb) cause to be nervous or upset | - |
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| (verb) be flustered; behave in a confused manner | - |
| flute | (verb) form flutes in | - |
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| flutter | (verb) wink briefly | Synonyms: bat |
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| (verb) beat rapidly | Synonyms: palpitate |
| (verb) move back and forth very rapidly | Synonyms: flicker, flitter, quiver, waver |
| (verb) move along rapidly and lightly; skim or dart | Synonyms: dart, fleet, flit |
| (verb) flap the wings rapidly or fly with flapping movements | - |
| flux | (verb) mix together different elements | Synonyms: blend, coalesce, combine, commingle, conflate, fuse, immix, meld, merge, mix |
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| (verb) become liquid or fluid when heated | Synonyms: liquefy, liquify |
| (verb) move or progress freely as if in a stream | Synonyms: flow |
| fly | (verb) decrease rapidly and disappear | Synonyms: vanish, vaporize |
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| (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 | - |
| flyfish | (verb) fish with flies as lures | Synonyms: fly-fish |
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