The initial idioms of the letter C

collect around	collect dust
collect for	collect from
collect (one's) thoughts	collect (one's) wits
collect on	collect thoughts
collect up	collect
collection	collector
collector's item	collector's piece
college	collide with
collision	collude with
Colonel Blimp	colonel
color	color in
color inside the lines	color of someone's money, see the
color outside the lines	colored
coloured	colour
Columbia	Columbian gold