| 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 |