The initial idioms of the letter C

chalk up	chalk up to
put down to experience	challenge on
challenge the status quo	challenge to
challenged	challenge
cham	chamber
chamber of commerce	chammy
champ	champagne taste on a beer budget
champ at the bit	champers
breakfast of champions	chance
chance arm	chance it
chance of a lifetime	chance on
chance upon (someone or something)	chance upon
Chance would be a fine thing!	in chancery
chances are	change
change back	change down