- Simplex
- Simple fruit
- Stock-still
- Stock-taking
- Sand-blind
- Sang-froid
- Stomach-pump
- Stone-cold
- Stony-broke
- Singable
- Single-barrelled
- Single-minded
- Stone-dead
- Single-mindedly
- Single-breasted
- Sitting-room
- Sit-down strike
- Sauce-boat
- Saved up
- Saved
- Sixthly
- Sketch-map
- Skew-eyed
- Savoir-faire
- Story-book
- Story-teller
- Stout-hearted
- Storm-tossed
- Skin-tight
- Skinned
- Ski-plane
- Skin-graft
- Scalded
- Sky-high
- Scallops
- Slandering
- Slap-up
- Strait-laced
- Sci-fi
- Slide-rule
- Scolded
- Scorbutic
- Slow-moving
- Slow-witted
- Slums
- Score-card
- Small-time
- Smilingly
- Smooth-faced
- Scraped