safe and sound
save something for a rainy day, to - to prepare for trouble, usually by saving money
second nature - easy and natural to someone
second to none - the very best
see eye to eye, to - to agree completely
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shake a leg, to - to hurry up, move faster
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sick and tired - very annoyed, very tired of doing something
sink or swim - fail or succeed, no matter what
six of one, half a dozen of the other - no difference, either choice okay
sixth sense - a special feeling for something, or a special understanding of things
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smart aleck, a - someone who acts as if he or she knows everything and is often rude about it
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smell a rat, to - to think there may be something wrong
snowed under - having a lot of work to do
soap opera - a drama on TV or radio that continues over time and in which the characters have many problems
song and dance, a - a long explanation, a long excuse that is often not true
sooner or later - eventually, after some time
spick-and-span - very clean
sponge off, to - to take money or hospitality and never pay anything back
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stuffed shirt, a - one who lives by the rules and is very formal
