The initial idioms of the letter C

can of corn	can of worms
can on ear	can see (from) a mile off
(someone) could sell an icebox to an Eskimo	(someone) could sell sawdust to a lumber mill
can take it to the bank	can talk the hind leg off a donkey
can talk the legs off an iron pot	can too
Could we continue this later?	can whistle for
Can you imagine?	canary
canary in a coal mine	cancel Christmas
cancel each other out	cancel out
cancel out of	cancel someone’s Christmas
cancel someone out of something	cancel
cancer stick	candidate
candied	candle
candle in the wind	candlelight
can-do	candy