| Cadillac problem | | | |
| cake and gingerbread | | | |
| cake crumbs | | | |
| cakes and ale | | | |
| cake walk | | | |
| cakewalk | | | |
| call a lid | | | |
| call an audible | | | |
| call a spade a spade | | | |
| call it | | | |
| call it a day | | | |
| call it an early night | | | |
| call it a night | | | |
| call it stumps | | | |
| call off the dogs | | | |
| call on | | | |
| call out | | | |
| callout | | | |
| call roll | | | |
| call someone every name in the book | | | |
| call someone everything but a child of God | | | |
| call someone's bluff | | | |
| call someone's number | | | |
| call to account | | | |
| call to the bar | | | |
| call up | | | |
| calm before the storm | | | |
| camel's nose | | | |
| camel through the eye of a needle | | | |
| camp as a row of tents | | | |
| camp out | | | |
| camp out on | | | |
| canary fit | | | |
| canary in a coal mine | | | |
| cancel someone's Christmas | | | |
| candle | | | |
| candle in the wind | | | |
| can it | | | |
| cannot make it | | | |
| can of corn | | | |
| can of worms | | | |
| can't carry a tune in a bucket | | | |
| can't get enough | | | |
| can't help | | | |
| can't stand | | | |
| can't stand the sight of | | | |
| can't wait | | | |
| cap in hand | | | |
| cap it all off | | | |
| cap over the windmill | | | |
| captain's pick | | | |
| carbonated water | | | |
| carbon burning | | | |
| card of ten | | | |
| care a button | | | |
| care a jackstraw | | | |
| care a whit | | | |
| care package | | | |
| carriage trade | | | |
| carried away | | | |
| carrot and stick | | | |
| carry a torch | | | |
| carry away | | | |
| carry coals to Newcastle | | | |
| carry forward | | | |
| carry off | | | |
| carry on | | | |
| carry oneself | | | |
| carry one's weight | | | |
| carry out | | | |
| carry over | | | |
| carry someone's water | | | |
| carry the ball | | | |
| carry the can | | | |
| carry the mail | | | |
| carry the message to Garcia | | | |
| carry through | | | |
| carry water for | | | |
| carved in stone | | | |
| case the joint | | | |
| cashed up | | | |
| cash in one's chips | | | |
| cash on the barrelhead | | | |
| cash up | | | |
| cast a chill | | | |
| cast a shadow | | | |
| cast aside | | | |
| cast aspersions | | | |
| cast in concrete | | | |
| cast in someone's teeth | | | |
| castle in the air | | | |
| cast loose | | | |
| cast of thousands | | | |
| cast one's bread upon the waters | | | |
| cast one's mind back | | | |
| cast one's net wide | | | |
| cast one's vote | | | |
| cast over | | | |
| cast pearls before swine | | | |
| cast snowballs | | | |