English idiom list

show the flag
show who's boss
shuffle off this mortal coil
shut one's eyes
shut one's face
shut one's trap
sick and tired
sick at heart
sick man
sick to the back teeth
side issue
sift out
sigh of relief
sign in
sign on the dotted line
silly me
silver screen
silver-tongued
sing a different tune
sing from the same hymnbook
sing off the same hymn sheet
sing the same tune
sin tax
sit in for
sit one's ass down
sit right
sitting
six and two threes
six-pack of rolls
size up
skate over
skeleton in the closet
skin in the game
skip out
skunk at a garden party
slam dunk
slash
sleep camel
sleeping giant
sleep on
sleep with the fishes
slender reed
sling one's hook
slip into
slippery as an eel
slip up
slop out
slower than molasses
slow study
slug it out
small fry
small wonder
smash hit
smash up
smell fishy
smell of the lamp
smell what someone is stepping in
smoke like a chimney
smoke the whole pack
smooth sailing
snap at
snap it up
snap to attention
sneaking suspicion
sneeze on the truth
snitches get stitches
snowball's chance in hell
snow on the rooftop
soaking wet
social death
soda jerk
soft
soften up
soft shoe
soft underbelly
someone's goose is cooked
some pumpkins
sometimes a cigar is just a cigar
song and dance
son of Adam
sore point
sort oneself out
so there
sound asleep
soup sandwich
sour grapes
sour stomach
sow dragon's teeth
sow the seeds of
spanielize
spank the monkey
spare no effort
spare someone the details
spare tyre
speak for
speak in circles
speak of the devil and he appears
speak one's mind
speak someone's language
speak up