silver fox
silver lining
sit on the fence
sit tight
sitting duck
sitting shotgun
six of one, half a dozen of the other
sixth sense
skating on thin ice
skid row
sky-high
slap on the wrist
sleep tight
slip of the tongue
slow day
smack dab
smell a rat
smell something fishy
smitten with
snow job
snow under
snowed in
snowed under
so and so
so far so good
so so
so to speak
son of a gun
southpaw
spanner in the works
spare, save blushes
speak of the devil
speak soon
speak too soon
speak up
spend a fortune
spend money like water
spick and span
spill the beans
spin a yarn
spine-tingling
spitting image
square peg in a round hole
stab in the back
stack the deck
BROWSE IDIOMS THAT START WITH LETTER "s"
A list of idioms in alphabetical order with definitions and examples