| cop oneself on | | | |
| cop one's whack | | | |
| cop out | | | |
| copper-bottomed | | | |
| corner the market | | | |
| corporate ladder | | | |
| corporate welfare bum | | | |
| corporation pop | | | |
| cost the earth | | | |
| cotton-picking | | | |
| cotton to | | | |
| couch potato | | | |
| cough up | | | |
| could not get elected dogcatcher | | | |
| couldn't be more different | | | |
| couldn't care less | | | |
| couldn't carry a note in a bucket | | | |
| couldn't happen to a nicer | | | |
| couldn't organise a piss-up in a brewery | | | |
| couldn't stop a pig in a passage | | | |
| count angels on pinheads | | | |
| count noses | | | |
| count one's blessings | | | |
| count one's days | | | |
| country mile | | | |
| count sheep | | | |
| count to five | | | |
| count to ten | | | |
| count to three | | | |
| courage of one's convictions | | | |
| court of public opinion | | | |
| covenant of salt | | | |
| cover one's bases | | | |
| cover one's feet | | | |
| cover someone's ass | | | |
| cover up | | | |
| cowboy killer | | | |
| cowboy shower | | | |
| cowboy up | | | |
| cowgirl position | | | |
| cow juice | | | |
| crab mentality | | | |
| crack a crust | | | |
| crack a fat | | | |
| crack a smile | | | |
| crack down | | | |
| crack of dawn | | | |
| crack through | | | |
| crack up | | | |
| cradle robber | | | |
| cradle snatcher | | | |
| cradle-to-grave | | | |
| cramp someone's style | | | |
| crank one's hog | | | |
| crank out | | | |
| crank the handle | | | |
| crank up | | | |
| crapshoot | | | |
| crap up | | | |
| crash course | | | |
| crash dive | | | |
| crawl before one walks | | | |
| crawl into a hole | | | |
| crawl over each other | | | |
| crawl with | | | |
| crazy enough to work | | | |
| cream in one's coffee | | | |
| cream in one's jeans | | | |
| cream of the crop | | | |
| cream the crop | | | |
| creature comfort | | | |
| creature feature | | | |
| creature of habit | | | |
| creature of statute | | | |
| creature of the night | | | |
| creepy-peepy | | | |
| crème de la crème | | | |
| crescent spanner | | | |
| criss-cross applesauce | | | |
| crocodile tear | | | |
| crony capitalism | | | |
| crop up | | | |
| cross my heart | | | |
| cross my heart and hope to die | | | |
| cross off | | | |
| cross of gold | | | |
| cross out | | | |
| cross paths | | | |
| cross-purpose | | | |
| cross someone's palm | | | |
| cross someone's path | | | |
| cross swords | | | |
| cross that bridge when one comes to it | | | |
| cross the aisle | | | |
| cross the line | | | |
| cross the Rubicon | | | |
| cross the Thames | | | |
| cross the Tiber | | | |
| cross to bear | | | |
| cross to take up | | | |
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