The initial idioms of the letter C

cotton-pickin’	cotton-picking
couch in	couch potato
couch-doctor	couch
couch-turkey	cougar
cough	cough head off
Cough it up!	cough out
cough something up	cough up
could	could be better
could be worse	could care less
could do with	could do with one arm tied behind back
could fight a circle-saw	could have fooled me
could hear a pin drop	you could hear the grass grow(ing)
Could I be excused?	Could I call you?
Could I come in?	Could I get by, please?
Could I have a lift?	Could I have call you?