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A bird in the hand is worth two in the bush
A bunch of fives
A chain is only as strong as its weakest link
A countenance more in sorrow than in anger
A Daniel come to judgement
A diamond in the rough
A diamond is forever
A dish fit for the gods
A drop in the bucket
A fate worse than death
A feather in one's cap
A fish out of water
A fly in the ointment
A fool's paradise
A foot in the door
A foregone conclusion
A friend in need is a friend indeed
A good man is hard to find
A hard man is good to find
A hiding to nothing - On 
A house divided against itself cannot stand
A knight in shining armour
À la carte
À la mode
À legend in one's own lifetime
A leopard cannot change its spots
A little bird told me
A little knowledge is a dangerous thing
A load of cobblers
A man after my own heart
A ministering angel shall my sister be
A nation of shopkeepers
A no-brainer
A picture is worth a thousand words
A place for everything and everything in its place
A plague on both your houses
A priori
A riddle wrapped up in an enigma
A rose by any other name would smell as sweet
A rose is a rose is a rose
A safe pair of hands
A sea change
A sledgehammer to crack a nut
A shot in the arm
A sight for sore eyes
A sorry sight
A stitch in time saves nine
A thing of beauty is a joy forever
A tinker's damn
A wolf in sheep's clothing
A woman needs a man like a fish needs a bicycle
A word in your shell-like
A1 at Lloyds
Abandon all hope ye who enter here
Abide with me
About face
About turn
Above board
Absence makes the heart grow fonder
Absent without leave
Absolute power corrupts absolutely
Accidentally on purpose
According to Hoyle
Ace in the hole
Achilles' heel
Acid test
Acronyms
Across the board
Act of God
Act the giddy goat
Action man
Adam's ale
Aga saga
Against the grain
Age before beauty
Age cannot wither her, nor custom stale her infinite variety
Agree to disagree
Aid and abet
Aide-mémoire
Air kiss
Air quotes
Al fresco
Alas, poor Yorick! I knew him, Horatio
Alike as two peas in a pod
Alive and kicking
All agog
All at sea
All fingers and thumbs
All good things come to he who waits
All present and correct
All singing, all dancing
All that glitters is not gold / All that glisters is not gold
All the tea in China - Not for
All things must pass
All you can eat
Alter ego
Amber nectar
An albatross round his neck
An apple a day keeps the doctor away
An arm and a leg
An eye for an eye, a tooth for a tooth
An ill wind
An offer he can't refuse
An Oxford scholar
Angry young man
Ankle biter
Annus horribilis
Another think coming
Apple of my eye - The
Apple pie order
April fool
Arm candy - see ear candy
Arms akimbo
Ars longa, vita brevis
Arty-farty
As XXX as YYY
As alike as two peas in a pod
As bald as a coot
As black as Newgate's knocker
As brown as a berry
As busy as a bee
As cold as any stone
As cool as a cucumber
As dead as a dodo
As dead as a doornail
As easy as pie
As fast as greased lightning
As fine as frog's hair
As fit as a butcher's dog
As fit as a fiddle
As good as gold
As good luck would have it
As happy as a clam
As happy as a sandboy
As happy as Larry
As keen as mustard
As mad as a hatter
As mad as a march hare
As nice as ninepence
As old as Methuselah
As old as the hills
As pleased as Punch
As queer as a nine bob note
As straight as a die
As the crow flies
As white as snow
Ashes to ashes dust to dust
(Ask not) for whom the bell tolls
(H)asta la vista, baby
At loggerheads
At one fell swoop
At one's beck and call
At sixes and sevens
Auld lang syne