[conversation piece] {n.} Something that interests people and makes them talk […]

[conviction] See: [HAVE THE COURAGE OF ONE'S CONVICTIONS].

[coo] "Cool"

[cook] See: [SHORT-ORDER COOK], [WHAT'S UP] or [WHAT'S COOKING].

[cook one's goose] {v. phr.}, {slang} To ruin someone hopelessly; destroy […]

[cook up] {v.}, {informal} To plan and put together; make up; […]

[cool] See: [BLOW ONE'S COOL].

[cool as a cucumber] {adj. phr.}, {informal} Very calm and brave; […]

[cool customer] {n.} Someone who is calm and in total control […]

[cool down] or [cool off] {v.} To lose or cause to […]