| sight for sore eyes |
| sight unseen |
| sign off |
| sign on |
| silent as the grave |
| silky smooth |
| silly money |
| silver-lined |
| silver sheet |
| silver tongue |
| simmer down |
| simplicity itself |
| sing along |
| sing for one's supper |
| singing soprano |
| single out |
| sing small |
| sing the praises of |
| sink in |
| sink of iniquity |
| siren song |
| sit in |
| sit in with |
| sit on a tack |
| sit on one's ass |
| sit on the fence |
| sit still |
| sit tight |
| sitting duck |
| sit with |
| six feet under |
| six of the best |
| sixth-rate |
| size queen |
| skate around |
| skate on thin ice |
| skeleton |
| skeleton crew |
| skeleton in the cupboard |
| skin and bones |
| skinny Liz |
| skip a beat |
| skip rope |
| skittles party |
| skyrocket |
| slam down |
| slap and tickle |
| slap someone around |
| slave to fashion |
| sleep a wink |
| sleep funny |
| sleeping at the switch |
| sleeping policeman |
| sleep off |
| sleep rough |
| sleep with |
| sleeveless errand |
| sleight of hand |
| slide into the DMs |
| sling off |
| slings and arrows |
| slip back to old ways |
| slip of the pen |
| slip out |
| slip someone's mind |
| slip through the cracks |
| slip-up |
| slop bowl |
| slow burn |
| slow-burning |
| slow march |
| slow on the uptake |
| slow up |
| slug away |
| slut's wool |
| small dick energy |
| small potatoes |
| small talk |
| smart arse |
| smart chance |
| smashing |
| smash someone's head |
| smear campaign |
| smell blood |
| smell like a rose |
| smell of an oily rag |
| smell of the shop |
| smell the barn |
| smile a thousand smiles |
| smoke-filled room |
| smoke one's own dope |
| smoke signal |
| smoking gun |
| smooth operator |
| snail's pace |
| snake oil |
| snap at someone's heels |
| snap, crackle and pop |
| snap judgment |
| snap someone's head off |
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