The initial idioms of the letter S

step outside	step over
step right up	step up
step up (one's) game	move up a gear
step up to	step up to the plate
step-by-step	stepped on
step	stern
sterner	Steven
stew	stew bum
stew in one's own juice	stew in own juice
stew zoo	stewed
stewed to the ears	stewed to the gills
stewed up	Stick ’em up!
stick (one's) spoon in the wall	stick a fork in (me/it/something)
stick around	stick at
stick by	stick by (one's) guns