The initial idioms of the letter C

contrary to popular belief	contrary to popular opinion
contrast with	contribute to
contribute	control freak
control over	control the purse strings
control	controlled substance
convalesce from	convenience
conventional wisdom	conventional
converge in upon (someone or something)	converge on
converge	conversation
conversation piece	converse with
deathbed conversion	convert
convert from	convey
convict of	conviction
convince of	convulse with
coo	cooch