| slab | (noun) block consisting of a thick piece of something | - |
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| slack | (noun) a cord or rope or cable that is hanging loosely | - |
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| (noun) the quality of being loose (not taut) | Synonyms: slackness |
| (noun) a stretch of water without current or movement | Synonyms: slack water |
| (noun) a soft wet area of low-lying land that sinks underfoot | Synonyms: mire, morass, quag, quagmire |
| (noun) a noticeable deterioration in performance or quality | Synonyms: drop-off, falling off, falloff, slump |
| (noun) dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve | - |
| slackening | (noun) an occurrence of control or strength weakening | Synonyms: loosening, relaxation |
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| slacker | (noun) a person who shirks his work or duty (especially one who tries to evade military service in wartime) | Synonyms: shirker |
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| slacking | (noun) the evasion of work or duty | Synonyms: goldbricking, goofing off, shirking, soldiering |
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| slackline | (noun) a partially tensioned line for balance or walking | - |
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| slackness | (noun) the quality of being loose (not taut) | Synonyms: slack |
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| (noun) the quality of being lax and neglectful | Synonyms: laxity, laxness, remissness |
| (noun) weakness characterized by a lack of vitality or energy | Synonyms: inanition, lassitude, lethargy |
| slacks | (noun) (used in the plural) pants for casual wear | - |
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| slag | (noun) the scum formed by oxidation at the surface of molten metals | Synonyms: dross, scoria |
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| slagheap | (noun) pile of waste matter from coal mining etc | - |
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| slain | (noun) people who have been slain (as in battle) | - |
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| slalom | (noun) a downhill race over a winding course defined by upright poles | - |
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| slam | (noun) an aggressive remark directed at a person like a missile and intended to have a telling effect | Synonyms: barb, dig, gibe, jibe, shaft, shot |
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| (noun) winning all or all but one of the tricks in bridge | Synonyms: sweep |
| (noun) a forceful impact that makes a loud noise | - |
| (noun) the noise made by the forceful impact of two objects | - |
| slammer | (noun) a correctional institution used to detain persons who are in the lawful custody of the government (either accused persons awaiting trial or convicted persons serving a sentence) | Synonyms: clink, gaol, jail, jailhouse, pokey, poky |
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| (noun) a person who closes things violently | - |
| slander | (noun) an abusive attack on a person's character or good name | Synonyms: aspersion, calumny, defamation, denigration |
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| (noun) words falsely spoken that damage the reputation of another | - |
| slanderer | (noun) one who attacks the reputation of another by slander or libel | Synonyms: backbiter, defamer, libeler, maligner, traducer, vilifier |
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| slanderousness | (noun) The property of being both untrue and harmful to a reputation. | - |
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| slang | (noun) a characteristic language of a particular group (as among thieves) | Synonyms: argot, cant, jargon, lingo, patois, vernacular |
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| (noun) informal language consisting of words and expressions that are not considered appropriate for formal occasions; often vituperative or vulgar | Synonyms: slang expression, slang term |
| slanginess | (noun) casualness in use of language | - |
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| slanguage | (noun) language characterized by excessive use of slang or cant | - |
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| slant | (noun) degree of deviation from a horizontal plane | Synonyms: pitch, rake |
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| (noun) a biased way of looking at or presenting something | Synonyms: angle |
| slap | (noun) the act of smacking something; a blow delivered with an open hand | Synonyms: smack, smacking |
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| (noun) a blow from a flat object (as an open hand) | Synonyms: smack |
| slapper | (noun) a hitter who slaps (usually another person) with an open hand | Synonyms: spanker |
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| slapshot | (noun) a fast shot made with a short powerful swing of the hockey stick | - |
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| slapstick | (noun) acoustic device consisting of two paddles hinged together; used by an actor to make a loud noise without inflicting injury when striking someone | - |
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| (noun) a boisterous comedy with chases and collisions and practical jokes | - |
| slash | (noun) a strong sweeping cut made with a sharp instrument | Synonyms: gash |
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| (noun) a punctuation mark (/) used to separate related items of information | Synonyms: diagonal, separatrix, solidus, stroke, virgule |
| (noun) an open tract of land in a forest that is strewn with debris from logging (or fire or wind) | - |
| (noun) a wound made by cutting | Synonyms: cut, gash, slice |
| slasher | (noun) a weapon (a sword or dagger) used for slashing | - |
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| (noun) someone who slashes another person | - |
| slat | (noun) a thin strip (wood or metal) | Synonyms: spline |
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| slate | (noun) (formerly) a writing tablet made of slate | - |
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| (noun) a list of candidates nominated by a political party to run for election to public offices | Synonyms: ticket |
| (noun) a fine-grained metamorphic rock that can be split into thin layers | - |
| (noun) thin layers of rock used for roofing | Synonyms: slating |
| slater | (noun) any of various small terrestrial isopods having a flat elliptical segmented body; found in damp habitats | Synonyms: wood louse, woodlouse |
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| slatiness | (noun) The state or quality of being of or resembling the mineral slate. | - |
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| slating | (noun) the act of laying slates for a roof | - |
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| (noun) a severely critical attack | - |
| (noun) thin layers of rock used for roofing | Synonyms: slate |
| slattern | (noun) a dirty untidy woman | Synonyms: slovenly woman, slut, trollop |
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| (noun) a prostitute who attracts customers by walking the streets | Synonyms: floozie, floozy, hooker, hustler, street girl, streetwalker |
| slatternliness | (noun) in the manner of a slattern | Synonyms: sluttishness |
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| slaughter | (noun) the killing of animals (as for food) | - |
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| (noun) the savage and excessive killing of many people | Synonyms: butchery, carnage, mass murder, massacre |
| (noun) a sound defeat | Synonyms: debacle, drubbing, thrashing, trouncing, walloping, whipping |
| slaughterer | (noun) a person who slaughters or dresses meat for market | Synonyms: butcher |
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| slaughterhouse | (noun) a building where animals are butchered | Synonyms: abattoir, butchery, shambles |
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| slave | (noun) a person who is owned by someone | - |
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| (noun) someone who works as hard as a slave | Synonyms: hard worker, striver |
| (noun) someone entirely dominated by some influence or person | - |
| slaveholder | (noun) someone who holds slaves | Synonyms: slave owner, slaver |
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| slaveholding | (noun) the practice of owning slaves | Synonyms: slavery |
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| slaver | (noun) a person engaged in slave trade | Synonyms: slave dealer, slave trader |
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| (noun) someone who holds slaves | Synonyms: slave owner, slaveholder |
| slavery | (noun) work done under harsh conditions for little or no pay | - |
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| (noun) the practice of owning slaves | Synonyms: slaveholding |
| (noun) the state of being under the control of another person | Synonyms: bondage, thraldom, thrall, thralldom |
| slavey | (noun) a female domestic servant who does all kinds of menial work | Synonyms: skivvy |
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| slaw | (noun) basically shredded cabbage | Synonyms: coleslaw |
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| slayer | (noun) someone who causes the death of a person or animal | Synonyms: killer |
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| slaying | (noun) unlawful premeditated killing of a human being by a human being | Synonyms: execution, murder |
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| sleaze | (noun) tastelessness by virtue of being cheap and vulgar | Synonyms: cheapness, tackiness, tat |
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| sleaziness | (noun) a lack of elegance as a consequence of wearing threadbare or dirty clothing | Synonyms: manginess, seediness, shabbiness |
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| (noun) morally dishonorable | - |
| sled | (noun) a vehicle mounted on runners and pulled by horses or dogs; for transportation over snow | Synonyms: sledge, sleigh |
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| sledder | (noun) someone who rides a sled | - |
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| sledding | (noun) the sport of riding on a sled or sleigh | - |
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| (noun) advancing toward a goal | Synonyms: going |
| sledge | (noun) a heavy long-handled hammer used to drive stakes or wedges | Synonyms: maul, sledgehammer |
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| (noun) a vehicle mounted on runners and pulled by horses or dogs; for transportation over snow | Synonyms: sled, sleigh |
| sledgehammer | (noun) a heavy long-handled hammer used to drive stakes or wedges | Synonyms: maul, sledge |
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| sleekness | (noun) the smooth feel of silk fabric | Synonyms: silkiness |
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| (noun) the quality of being well-groomed and neatly tailored | - |
| sleep | (noun) a natural and periodic state of rest during which consciousness of the world is suspended | Synonyms: slumber |
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| (noun) euphemisms for death (based on an analogy between lying in a bed and in a tomb) | Synonyms: eternal rest, eternal sleep, quietus, rest |
| (noun) a torpid state resembling deep sleep | Synonyms: sopor |
| (noun) a period of time spent sleeping | Synonyms: nap |
| sleeper | (noun) an unexpected hit | - |
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| (noun) tropical fish that resembles a goby and rests quietly on the bottom in shallow water | Synonyms: sleeper goby |
| (noun) a passenger car that has berths for sleeping | Synonyms: sleeping car, wagon-lit |
| (noun) one of the cross braces that support the rails on a railway track | Synonyms: crosstie, railroad tie, tie |
| (noun) a piece of furniture that can be opened up into a bed | - |
| (noun) pajamas with feet; worn by children | - |
| (noun) a rester who is sleeping | Synonyms: slumberer |
| (noun) an unexpected achiever of success | - |
| (noun) a spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal | - |
| sleepiness | (noun) a very sleepy state | Synonyms: drowsiness, somnolence |
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| sleeping | (noun) the suspension of consciousness and decrease in metabolic rate | - |
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| (noun) quiet and inactive restfulness | Synonyms: dormancy, quiescence, quiescency |
| (noun) the state of being asleep | - |
| sleeplessness | (noun) a temporary state in which you are unable (or unwilling) to sleep | Synonyms: wakefulness |
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| sleepover | (noun) an occasion of spending a night away from home or having a guest spend the night in your home (especially as a party for children) | - |
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| sleepwalker | (noun) someone who walks about in their sleep | Synonyms: noctambulist, somnambulist |
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| sleepwalking | (noun) walking by a person who is asleep | Synonyms: noctambulation, noctambulism, somnambulation, somnambulism |
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| sleepwear | (noun) garments designed to be worn in bed | Synonyms: nightclothes, nightwear |
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| sleepyhead | (noun) a sleepy person | - |
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| sleet | (noun) partially melted snow (or a mixture of rain and snow) | - |
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| sleeve | (noun) the part of a garment that is attached at the armhole and that provides a cloth covering for the arm | Synonyms: arm |
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| (noun) small case into which an object fits | - |
| sleigh | (noun) a vehicle mounted on runners and pulled by horses or dogs; for transportation over snow | Synonyms: sled, sledge |
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| sleight | (noun) adroitness in using the hands | Synonyms: dexterity, manual dexterity |
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| slenderness | (noun) the quality of being slight or inadequate | - |
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| (noun) the property of an attractively thin person | Synonyms: slightness, slimness |
| (noun) relatively small dimension through an object as opposed to its length or width | Synonyms: tenuity, thinness |
| sleuth | (noun) a detective who follows a trail | Synonyms: sleuthhound |
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| sleuthhound | (noun) a breed of large powerful hound of European origin having very acute smell and used in tracking | Synonyms: bloodhound |
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| (noun) a detective who follows a trail | Synonyms: sleuth |
| sleuthing | (noun) a police investigation to determine the perpetrator | Synonyms: detecting, detection, detective work |
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| slew | (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, spate, stack, tidy sum, wad |
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| slews | (noun) a large number or amount | Synonyms: dozens, gobs, heaps, lashings, loads, lots, oodles, piles, rafts, scads, scores, stacks, tons, wads |
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| slice | (noun) a golf shot that curves to the right for a right-handed golfer | Synonyms: fade, slicing |
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| (noun) a spatula for spreading paint or ink | - |
| (noun) a serving that has been cut from a larger portion | Synonyms: piece |
| (noun) a thin flat piece cut off of some object | - |
| (noun) a share of something | Synonyms: piece |
| (noun) a wound made by cutting | Synonyms: cut, gash, slash |
| slicer | (noun) knife especially designed for slicing particular foods, as cheese | - |
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| (noun) a machine for cutting; usually with a revolving blade | - |
| (noun) a golfer whose shots typically curve right (for right-handed golfers) | - |
| slicing | (noun) the act of cutting into slices | - |
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| (noun) a golf shot that curves to the right for a right-handed golfer | Synonyms: fade, slice |
| slick | (noun) a trowel used to make a surface slick | - |
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| (noun) a film of oil or garbage floating on top of water | - |
| (noun) a slippery smoothness | Synonyms: slickness, slip, slipperiness |
| (noun) a magazine printed on good quality paper | Synonyms: glossy, slick magazine |
| slicker | (noun) a macintosh made from cotton fabric treated with oil and pigment to make it waterproof | Synonyms: oilskin |
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| (noun) someone who leads you to believe something that is not true | Synonyms: beguiler, cheat, cheater, deceiver, trickster |
| (noun) a person with good manners and stylish clothing | - |
| slickness | (noun) a slippery smoothness | Synonyms: slick, slip, slipperiness |
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| (noun) a kind of fluent easy superficiality | Synonyms: glibness |
| (noun) verbal misrepresentation intended to take advantage of you in some way | Synonyms: hanky panky, hocus-pocus, jiggery-pokery, skulduggery, skullduggery, trickery |
| slide | (noun) the act of moving smoothly along a surface while remaining in contact with it | Synonyms: coast, glide |
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| (noun) sloping channel through which things can descend | Synonyms: chute, slideway, sloping trough |
| (noun) a transparency mounted in a frame; viewed with a slide projector | Synonyms: lantern slide |
| (noun) a small flat rectangular piece of glass on which specimens can be mounted for microscopic study | Synonyms: microscope slide |
| (noun) plaything consisting of a sloping chute down which children can slide | Synonyms: playground slide, sliding board |
| (noun) (music) rapid sliding up or down the musical scale | Synonyms: swoop |
| (noun) (geology) the descent of a large mass of earth or rocks or snow etc. | - |
| slider | (noun) a fastball that curves slightly away from the side from which it was thrown | - |
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| (noun) freshwater turtle of United States and South America; frequently raised commercially; some young sold as pets | Synonyms: Pseudemys scripta, yellow-bellied terrapin |
| (noun) someone who races the luge | Synonyms: luger |
| (noun) a person who slips or slides because of loss of traction | Synonyms: skidder, slipper |
| slideway | (noun) sloping channel through which things can descend | Synonyms: chute, slide, sloping trough |
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| slight | (noun) a deliberate discourteous act (usually as an expression of anger or disapproval) | Synonyms: rebuff |
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| slightness | (noun) slenderness | Synonyms: delicacy |
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| (noun) the property of an attractively thin person | Synonyms: slenderness, slimness |
| (noun) the quality of being unimportant and petty or frivolous | Synonyms: pettiness, puniness, triviality |
| slime | (noun) any thick, viscous matter | Synonyms: goo, gook, goop, guck, gunk, muck, ooze, sludge |
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| sliminess | (noun) a property resembling or being covered with slime | - |
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| (noun) the quality of being disgusting to the senses or emotions | Synonyms: loathsomeness, lousiness, repulsiveness, vileness, wickedness |
| slimness | (noun) the property of an attractively thin person | Synonyms: slenderness, slightness |
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| (noun) a small margin | Synonyms: narrow margin, narrowness |
| sling | (noun) bandage to support an injured forearm; consisting of a wide triangular piece of cloth hanging from around the neck | Synonyms: scarf bandage, triangular bandage |
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| (noun) a plaything consisting of a Y-shaped stick with elastic between the arms; used to propel small stones | Synonyms: catapult, slingshot |
| (noun) a simple weapon consisting of a looped strap in which a projectile is whirled and then released | - |
| (noun) a shoe that has a strap that wraps around the heel | Synonyms: slingback |
| (noun) a highball with liquor and water with sugar and lemon or lime juice | - |
| slingback | (noun) a shoe that has a strap that wraps around the heel | Synonyms: sling |
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| slinger | (noun) a person who uses a sling to throw something | - |
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| slinging | (noun) throwing with a wide motion (as if with a sling) | - |
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| slingshot | (noun) a plaything consisting of a Y-shaped stick with elastic between the arms; used to propel small stones | Synonyms: catapult, sling |
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| slip | (noun) a flight maneuver; aircraft slides sideways in the air | Synonyms: sideslip |
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| (noun) a socially awkward or tactless act | Synonyms: faux pas, gaffe, gaucherie, solecism |
| (noun) the act of avoiding capture (especially by cunning) | Synonyms: eluding, elusion |
| (noun) an unexpected slide | Synonyms: sideslip, skid |
| (noun) a minor inadvertent mistake usually observed in speech or writing or in small accidents or memory lapses etc. | Synonyms: miscue, parapraxis, slip-up |
| (noun) a woman's sleeveless undergarment | Synonyms: chemise, shift, shimmy, teddy |
| (noun) bed linen consisting of a cover for a pillow | Synonyms: case, pillow slip, pillowcase |
| (noun) artifact consisting of a narrow flat piece of material | Synonyms: strip |
| (noun) a small sheet of paper | Synonyms: slip of paper |
| (noun) a slippery smoothness | Synonyms: slick, slickness, slipperiness |
| (noun) an accidental misstep threatening (or causing) a fall | Synonyms: trip |
| (noun) a place where a craft can be made fast | Synonyms: berth, moorage, mooring |
| (noun) a young and slender person | - |
| (noun) a part (sometimes a root or leaf or bud) removed from a plant to propagate a new plant through rooting or grafting | Synonyms: cutting |
| (noun) potter's clay that is thinned and used for coating or decorating ceramics | - |
| slipcover | (noun) a removable fitted cloth covering for upholstered furniture | - |
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| slipknot | (noun) a knot at the end of a cord or rope that can slip along the cord or rope around which it is made | - |
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| slipover | (noun) a sweater that is put on by pulling it over the head | Synonyms: pullover |
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| slippage | (noun) failing to hold or slipping out of place | - |
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| (noun) a decrease of transmitted power in a mechanical system caused by slipping | - |
| (noun) decline from a standard level of performance or achievement | - |
| slipper | (noun) low footwear that can be slipped on and off easily; usually worn indoors | Synonyms: carpet slipper |
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| (noun) a person who slips or slides because of loss of traction | Synonyms: skidder, slider |
| slipperiness | (noun) a slippery smoothness | Synonyms: slick, slickness, slip |
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| (noun) the quality of being a slippery rascal | Synonyms: rascality, shiftiness, trickiness |