The initial idioms of the letter C

ex cathedra	catholic
catholic bagel	Catholic twins
cats and dogs	cat's claw
cat's cradle	cat's meow
cat's pajamas	cat's paw
cat's whiskers	cat-soup
cat's-paw	catty
cattle	cattle call
cattle market	cattle-rustler
catty-corner	caucasian waste
caucus race	caught
caught bending	caught between the devil and the deep blue sea
caught dead, wouldn't be	caught flat-footed
caught in the act	caught in the crossfire
caught in the middle	caught on the hop