| slabber | (verb) let saliva drivel from the mouth | Synonyms: dribble, drivel, drool, slaver, slobber |
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| slack | (verb) release tension on | - |
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| (verb) make less active or fast | Synonyms: relax, slack up, slacken |
| (verb) make less active or intense | Synonyms: abate, slake |
| (verb) become slow or slower | Synonyms: slacken, slow, slow down, slow up |
| (verb) cause to heat and crumble by treatment with water | Synonyms: slake |
| (verb) become less in amount or intensity | Synonyms: abate, die away, let up, slack off |
| (verb) be inattentive to, or neglect | - |
| (verb) avoid responsibilities and work, be idle | - |
| slacken | (verb) become looser or slack | - |
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| (verb) make slack as by lessening tension or firmness | Synonyms: remit |
| (verb) become slow or slower | Synonyms: slack, slow, slow down, slow up |
| (verb) make less active or fast | Synonyms: relax, slack, slack up |
| slag | (verb) convert into slag | - |
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| slake | (verb) make less active or intense | Synonyms: abate, slack |
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| (verb) cause to heat and crumble by treatment with water | Synonyms: slack |
| (verb) satisfy (thirst) | Synonyms: allay, assuage, quench |
| slalom | (verb) race on skis around obstacles | - |
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| slam | (verb) strike violently | Synonyms: bang |
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| (verb) close violently | Synonyms: bang |
| (verb) throw violently | Synonyms: flap down |
| (verb) dance the slam dance | Synonyms: mosh, slam dance, thrash |
| slander | (verb) charge falsely or with malicious intent; attack the good name and reputation of someone | Synonyms: asperse, besmirch, calumniate, defame, denigrate, smear, smirch, sully |
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| slang | (verb) abuse with coarse language | - |
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| (verb) fool or hoax | Synonyms: befool, cod, dupe, fool, gull, put on, put one across, put one over, take in |
| (verb) use slang or vulgar language | - |
| slant | (verb) present with a bias | Synonyms: angle, weight |
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| (verb) to incline or bend from a vertical position | Synonyms: angle, lean, tilt, tip |
| (verb) heel over | Synonyms: cant, cant over, pitch, tilt |
| (verb) lie obliquely | - |
| slap | (verb) hit with something flat, like a paddle or the open hand | - |
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| (verb) to play music at loud volume | Synonyms: bump |
| slash | (verb) cut drastically | - |
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| (verb) cut open | Synonyms: gash |
| (verb) cut with sweeping strokes; as with an ax or machete | Synonyms: cut down |
| (verb) beat severely with a whip or rod | Synonyms: flog, lash, lather, strap, trounce, welt, whip |
| (verb) move or stir about violently | Synonyms: convulse, jactitate, thrash, thrash about, thresh, thresh about, toss |
| slat | (verb) close the slats of (windows) | - |
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| (verb) equip or bar with slats | - |
| slate | (verb) designate or schedule | - |
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| (verb) cover with slate | - |
| (verb) enter on a list or slate for an election | - |
| slather | (verb) spread thickly | - |
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| slaughter | (verb) kill a large number of people indiscriminately | Synonyms: massacre, mow down |
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| (verb) kill (animals) usually for food consumption | Synonyms: butcher |
| slave | (verb) work very hard, like a slave | Synonyms: break one's back, buckle down, knuckle down |
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| slaver | (verb) let saliva drivel from the mouth | Synonyms: dribble, drivel, drool, slabber, slobber |
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| slay | (verb) kill intentionally and with premeditation | Synonyms: bump off, dispatch, hit, murder, off, polish off, remove |
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| (verb) to succeed greatly | - |
| sled | (verb) ride (on) a sled | Synonyms: sleigh |
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| sledge | (verb) beat with a sledgehammer | Synonyms: sledgehammer |
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| (verb) transport in a sleigh | - |
| (verb) ride in or travel with a sledge | - |
| sledgehammer | (verb) beat with a sledgehammer | Synonyms: sledge |
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| sleek | (verb) make slick or smooth | Synonyms: slick |
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| sleep | (verb) be asleep | Synonyms: catch some Z's, kip, log Z's, slumber |
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| (verb) be able to accommodate for sleeping | - |
| sleepwalk | (verb) walk in one's sleep | Synonyms: somnambulate |
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| sleet | (verb) precipitate as a mixture of rain and snow | - |
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| sleigh | (verb) ride (on) a sled | Synonyms: sled |
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| slenderise | (verb) make slender or appear to be slender | Synonyms: slenderize |
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| slenderize | (verb) take off weight | Synonyms: melt off, reduce, slim, slim down, thin |
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| (verb) make slender or appear to be slender | Synonyms: slenderise |
| sleuth | (verb) watch, observe, or inquire secretly | Synonyms: snoop, spy, stag |
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| slew | (verb) turn sharply; change direction abruptly | Synonyms: curve, cut, sheer, slue, swerve, trend, veer |
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| (verb) move obliquely or sideways, usually in an uncontrolled manner | Synonyms: skid, slide, slip, slue |
| slice | (verb) hit a ball so that it causes a backspin | - |
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| (verb) cut into slices | Synonyms: slice up |
| (verb) make a clean cut through | Synonyms: slit |
| (verb) hit a ball and put a spin on it so that it travels in a different direction | - |
| slick | (verb) give a smooth and glossy appearance | Synonyms: sleek down, slick down |
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| (verb) make slick or smooth | Synonyms: sleek |
| slide | (verb) to pass or move unobtrusively or smoothly | Synonyms: slither |
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| (verb) move obliquely or sideways, usually in an uncontrolled manner | Synonyms: skid, slew, slip, slue |
| (verb) move smoothly along a surface | - |
| slight | (verb) pay no attention to, disrespect | Synonyms: cold-shoulder |
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| slim | (verb) take off weight | Synonyms: melt off, reduce, slenderize, slim down, thin |
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| slime | (verb) cover or stain with slime | - |
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| sling | (verb) hurl as if with a sling | Synonyms: catapult |
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| (verb) hold or carry in a sling | - |
| (verb) move with a sling | - |
| (verb) hang loosely or freely; let swing | - |
| slink | (verb) walk stealthily | - |
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| slip | (verb) fall to a lower standard | Synonyms: drop away, drop off, fall away |
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| (verb) move out of position | Synonyms: dislocate, luxate, splay |
| (verb) insert inconspicuously or quickly or quietly | - |
| (verb) to make a mistake or be incorrect | Synonyms: err, mistake |
| (verb) pass out of one's memory | Synonyms: slip one's mind |
| (verb) move obliquely or sideways, usually in an uncontrolled manner | Synonyms: skid, slew, slide, slue |
| (verb) move stealthily | Synonyms: steal |
| (verb) move easily | - |
| (verb) move smoothly and easily | - |
| (verb) cause to move with a smooth or sliding motion | - |
| (verb) pass on stealthily | Synonyms: sneak |
| slit | (verb) cut a slit into | - |
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| (verb) make a clean cut through | Synonyms: slice |
| slither | (verb) to pass or move unobtrusively or smoothly | Synonyms: slide |
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| sliver | (verb) break up into splinters or slivers | Synonyms: splinter |
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| (verb) form into slivers | - |
| (verb) divide into slivers or splinters | Synonyms: splinter |
| slobber | (verb) let saliva drivel from the mouth | Synonyms: dribble, drivel, drool, slabber, slaver |
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| slog | (verb) strike heavily, especially with the fist or a bat | Synonyms: slug, swig |
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| (verb) walk heavily and firmly, as when weary, or through mud | Synonyms: footslog, pad, plod, tramp, trudge |
| (verb) work doggedly or persistently | Synonyms: keep one's nose to the grindstone, keep one's shoulder to the wheel, peg away, plug away |
| sloganeer | (verb) coin new slogans | - |
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| slop | (verb) feed pigs | Synonyms: swill |
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| (verb) cause or allow (a liquid substance) to run or flow from a container | Synonyms: spill, splatter |
| (verb) ladle clumsily | - |
| (verb) walk through mud or mire | Synonyms: slosh, splash, splosh, squelch, squish |
| slope | (verb) be at an angle | Synonyms: incline, pitch |
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| slosh | (verb) spill or splash copiously or clumsily | Synonyms: slosh around, slush, slush around |
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| (verb) walk through mud or mire | Synonyms: slop, splash, splosh, squelch, squish |
| (verb) make a splashing sound | Synonyms: slush, splash, splosh |
| slot | (verb) assign a time slot | - |
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| slouch | (verb) walk slovenly | - |
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| (verb) assume a drooping posture or carriage | Synonyms: slump |
| slough | (verb) cast off hair, skin, horn, or feathers | Synonyms: exuviate, molt, moult, shed |
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| slow | (verb) lose velocity; move more slowly | Synonyms: decelerate, retard, slow down, slow up |
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| (verb) become slow or slower | Synonyms: slack, slacken, slow down, slow up |
| (verb) cause to proceed more slowly | Synonyms: slow down, slow up |
| slue | (verb) turn sharply; change direction abruptly | Synonyms: curve, cut, sheer, slew, swerve, trend, veer |
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| (verb) move obliquely or sideways, usually in an uncontrolled manner | Synonyms: skid, slew, slide, slip |
| slug | (verb) strike heavily, especially with the fist or a bat | Synonyms: slog, swig |
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| (verb) be idle; exist in a changeless situation | Synonyms: idle, laze, stagnate |
| sluice | (verb) irrigate with water from a sluice | Synonyms: flush |
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| (verb) draw through a sluice | - |
| (verb) transport in or send down a sluice | - |
| (verb) pour as if from a sluice | Synonyms: sluice down |
| slum | (verb) spend time at a lower socio-economic level than one's own, motivated by curiosity or desire for adventure; usage considered condescending and insensitive | - |
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| slumber | (verb) be asleep | Synonyms: catch some Z's, kip, log Z's, sleep |
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| slump | (verb) fall heavily or suddenly; decline markedly | Synonyms: fall off, sink |
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| (verb) fall or sink heavily | Synonyms: sink, slide down |
| (verb) assume a drooping posture or carriage | Synonyms: slouch |
| (verb) fall in value | Synonyms: correct, decline |
| slur | (verb) become vague or indistinct | Synonyms: blur, dim |
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| (verb) utter indistinctly | - |
| (verb) speak disparagingly of; e.g., make a racial slur | - |
| (verb) play smoothly or legato | - |
| slurp | (verb) eat noisily | - |
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| slush | (verb) spill or splash copiously or clumsily | Synonyms: slosh, slosh around, slush around |
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| (verb) make a splashing sound | Synonyms: slosh, splash, splosh |