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 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 his shoulder Chit-chat Chock-a-block Chop and change Chop-chop Chow down Christmas box - A Christmas card verses Clean breas - make a Clear blue water 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 Cockney rhyming slang 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 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 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