Call a spade a spade
Call of the wild - The
Camera cannot lie - The
Can't hold a candle to
Canteen culture
Carbon-copy
Carbon footprint
Card-sharp
Carey Street - On
Carpe diem
Carry coals to Newcastle
Cash on the nail
Cart before the horse - Put the
Carte blanche
(Ne'er) cast a clout till May be out
Cat out of the bag - Let the
Catbird seat - In the
Catch 22
Cat's Cradle
Caught in a cleft stick
Caught by the short hairs
Caught red-handed
Chain is only as strong as its weakest link - A
Chaise lounge
Chalk and cheese
Channel surfing
Charley horse
Charm offensive
Cheap at half the price
Cherchez la femme
Chew the cud
Chick flick
Chickens come home to roost
Chinless wonder
Chip off the old block
Chip on your shoulder
Chit-chat
Chock-a-block
Chop and change
Chop-chop
Chow down
Christmas box - A
Christmas card verses
Clean breast - make a
Clear blue water
Cleft stick - In a
Cliff-hanger
Climb on the bandwagon
Clod-hopper
Close, but no cigar
Close quarters
Close your eyes and think of England
Cloud cuckoo land
Cloud nine
Clue - don't have a
Cobblers - A load of
Cock-sure
Cock a snook
Cock and bull story
Cock-up
Cockney rhyming slang
Codswallop - a load of
Cogito ergo sum
Coin a phrase
Cold as any stone
Cold comfort
Cold enough to freeze the balls off a brass monkey
Cold feet
Cold shoulder
Cold turkey
Collywobbles - The
Colour up
Come a cropper
Come clean
Come on down
Come up trumps
Come what come may
Comes to the crunch - (When it)
(Coming in) on a wing and a prayer
Comparisons are odious
Compassion fatigue
Cook the books
Cookie cutter
Cool as a cucumber
Cool Britannia
Cop an attitude
Copper-bottomed
Cor blimey
Cordon bleu
Cost an arm and a leg
Cotton-picking
Countenance more in sorrow than in anger - A
Counting sheep
Course of true love never did run smooth - The
Crack of doom - The
Crapper - The
Crop up
Crocodile tears
Cry havoc and let slip the dogs of war
Curate's egg
Curiosity killed the cat
Curry favour
Customer is always right - The
Cut and run
Cut of your jib - The
Cut off without a penny
Cut off your nose to spite your face
Cut the mustard
Cut to the chase