| sack of crap | | | |
| sad panda | | | |
| sail the Red Sea | | | |
| salad year | | | |
| salt in the wound | | | |
| same difference | | | |
| save by the bell | | | |
| save it | | | |
| save something for a rainy day | | | |
| saw logs | | | |
| say goodbye | | | |
| say one's prayers | | | |
| say what | | | |
| scared shitless | | | |
| scare straight | | | |
| scholar and gentleman | | | |
| Schwung | | | |
| scrape along | | | |
| scrape together | | | |
| scratch one's head | | | |
| scratch the surface | | | |
| scream loudest | | | |
| screwed up | | | |
| screw this | | | |
| seagull approach | | | |
| seal the deal | | | |
| second fiddle | | | |
| second string | | | |
| see a man about a dog | | | |
| see for oneself | | | |
| see past the end of one's nose | | | |
| see stars | | | |
| see the light of day | | | |
| see through | | | |
| see yellow | | | |
| seize the day | | | |
| sell bargains | | | |
| sell down the river | | | |
| sell like hot cakes | | | |
| sell one's own grandmother | | | |
| sell the family silver | | | |
| send away for | | | |
| send someone to the showers | | | |
| send word | | | |
| serve someone right | | | |
| serve up | | | |
| set down | | | |
| set in motion | | | |
| set of pipes | | | |
| set one's heart on | | | |
| set out one's stall | | | |
| set the bar | | | |
| set the Thames on fire | | | |
| settle for | | | |
| settle someone's hash | | | |
| set up one's staff | | | |
| sex on legs | | | |
| sexual relation | | | |
| sexy up | | | |
| shake a leg | | | |
| shake out | | | |
| sham Abraham | | | |
| shanks' pony | | | |
| shark bait | | | |
| sharp-set | | | |
| sheathe the sword | | | |
| shed light upon | | | |
| shift the dial | | | |
| shirtless | | | |
| shit in someone's Cheerios | | | |
| shit or get off the pot | | | |
| shit-stir | | | |
| shiver me timbers | | | |
| shoot 'em up | | | |
| shoot off | | | |
| shoot one's load | | | |
| shoot the messenger | | | |
| short leash | | | |
| short strokes | | | |
| shotgun wedding | | | |
| shoulder to cry on | | | |
| show a clean pair of heels | | | |
| showdown | | | |
| show one's butt | | | |
| show one's true stripes | | | |
| show someone the door | | | |
| shrinking violet | | | |
| shut one's eyes and think of England | | | |
| shy bladder | | | |
| sick list | | | |
| sick with worry | | | |
| sift through | | | |
| sight to behold | | | |
| sign of the times | | | |
| silent killer | | | |
| silly season | | | |
| silver spoon | | | |
| simple as kiss your hand | | | |
| singe one's wings | | | |
| single-minded | | | |