[close-up] {n.} A photograph, motion picture, or video camera shot taken […]

[closed book] {n.} A secret; something not known or understood. * […]

[closed shop] {n. phr.} 1. A plant or factory that employs […]

[closed-door] {adj.} Away from the public; in private or in secret; […]

[closet] See: [SKELETON IN THE CLOSET].

[clothes] See: [BEST BIB AND TUCKER] or [SUNDAY-GO-TO-MEETING CLOTHES].

[clothing] See: [WOLF IN SHEEP'S CLOTHING].

[cloud] See: [EVERY CLOUD HAS A SILVER LINING], [IN THE CLOUDS], […]

[clover] See: [FOUR-LEAF CLOVER], [IN CLOVER] or [IN THE CLOVER].

[club] See: [CHRISTMAS CLUB].