The initial idioms of the letter S

second cousin	second fiddle
second gear	second hand
second nature	Second place is the first loser.
second sight	second thoughts
second to none	second wind
second-guess	secret
secs	section off
section	secure
secure against	security
security against	security blanket
seduce from	see a man about a dog
see about	see across
see after	see against
see ahead	see around
see as	see back