As black as a sweep
As black as coal
As black as night
As black as pitch
As black as the ace of spades
As blind as a bat
As broad as a barn door
As busy as a beaver
As busy as a bee
As busy as a one-armed paperhanger
As busy as popcorn on a skillet
As calm as a toad in the sun
As clean as a hound's tooth
As conceited as a barber's cat
As cool as a cucumber
As crazy as a bedbug
As crazy as a loon
As crooked as a dog's hind leg
As dead as a dodo
As drunk as a skunk
As dry as a bone
As easy as ABC
As easy as apple pie
As easy as duck soup
As far as
As far as possible
As fat as a pig
As flat as a pancake
As free as a bird
As full/tight as a tick
As gaudy as a butterfly
As gentle as a lamb
As good as one's word
As graceful as a swan
As gruff as a bear
As happy as a clam
As happy as a lark
As hard as nails
As hoarse as a crow
As hungry as a bear
As innocent as a lamb
As long as
As luck would have it
As mad as a hornet
As mad as a wet hen
As meek as a lamb
As merry as a cricket
As naked as a jaybird
As nervous as a cat
As nutty as a fruitcake
As old as the hills
As one
As phony as a three-dollar bill
As plain as the nose on one's face
As poor as a church mouse
As proud as a peacock
As quiet as a mouse
As red as a cherry
As red as a lobster
As red as a poppy
As red as a rose
As red as a ruby
As red as blood
As scarce as hen's teeth
As scarce as hen's teeth/scarcer than hen's teeth
As scared as a rabbit
As sick as a dog
As silly as a goose
As slippery as an eel
As sly as a fox
As snug as a bug in a rug
As sober as a judge
As soft as a baby's bottom
As soft as down
As sound as a dollar
As sour as vinegar
As strong as a horse/lion/ox
As stubborn as a mule
As such
As sweet as honey/sugar
As the crow flies
As thick as pea soup
As ugly as a toad
As usual
As warm as toast
As weak as a kitten
As well as
As white as a ghost
As white as a sheet
As white as the driven snow
As wild as a tiger
As wise as an owl
As yet
ASAP
Ask (someone) out
Ask for someone's hand in marriage
Ask for the moon
Ask for trouble
Asleep at the switch
Assault and battery
Assault the ears
Assemble a case (against someone)
Assume liability
At (someone's) beck and call
At (someone's) earliest convenience
At (someone's) service
At a loss
At a loss (for words)
At a premium
At a sitting
At a stretch
At all costs
At any rate
At arm's length
At bay
At best
At cross-purposes
At death's door