to be extremely worried.

Why didn't you call me when you knew you were going to be late? I was worried sick about you! (often + about)

• as drunk as a skunk
• a sea change
• as easy as A, B, C
• as easy as falling off a log
• as easy as pie
• a second-class citizen
• a self-made man
• a seven-day wonder
• a sex kitten
• a sex object
• as far as
• as far as are concerned
• as far as goes
• as far as I can see
• as far as possible
• as far as something goes
• as far as you are concerned
• as follows
• as free as a bird
• as good as
• as good as new
• a shadow of former self
• a shadow of its former self
• a shadow of your former self
• a shaggy dog story