| show the flag |
| show who's boss |
| shuffle off this mortal coil |
| shut one's eyes |
| shut one's face |
| shut one's trap |
| sick and tired |
| sick at heart |
| sick man |
| sick to the back teeth |
| side issue |
| sift out |
| sigh of relief |
| sign in |
| sign on the dotted line |
| silly me |
| silver screen |
| silver-tongued |
| sing a different tune |
| sing from the same hymnbook |
| sing off the same hymn sheet |
| sing the same tune |
| sin tax |
| sit in for |
| sit one's ass down |
| sit right |
| sitting |
| six and two threes |
| six-pack of rolls |
| size up |
| skate over |
| skeleton in the closet |
| skin in the game |
| skip out |
| skunk at a garden party |
| slam dunk |
| slash |
| sleep camel |
| sleeping giant |
| sleep on |
| sleep with the fishes |
| slender reed |
| sling one's hook |
| slip into |
| slippery as an eel |
| slip up |
| slop out |
| slower than molasses |
| slow study |
| slug it out |
| small fry |
| small wonder |
| smash hit |
| smash up |
| smell fishy |
| smell of the lamp |
| smell what someone is stepping in |
| smoke like a chimney |
| smoke the whole pack |
| smooth sailing |
| snap at |
| snap it up |
| snap to attention |
| sneaking suspicion |
| sneeze on the truth |
| snitches get stitches |
| snowball's chance in hell |
| snow on the rooftop |
| soaking wet |
| social death |
| soda jerk |
| soft |
| soften up |
| soft shoe |
| soft underbelly |
| someone's goose is cooked |
| some pumpkins |
| sometimes a cigar is just a cigar |
| song and dance |
| son of Adam |
| sore point |
| sort oneself out |
| so there |
| sound asleep |
| soup sandwich |
| sour grapes |
| sour stomach |
| sow dragon's teeth |
| sow the seeds of |
| spanielize |
| spank the monkey |
| spare no effort |
| spare someone the details |
| spare tyre |
| speak for |
| speak in circles |
| speak of the devil and he appears |
| speak one's mind |
| speak someone's language |
| speak up |
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