He has been sent to prison because he was a cold-blooded murderer.
To get cold-feet: to feel afraid, to yellow, to chicken out, to lose courage:
She´s getting cold about getting married, although she sure loves her fiancé very much.
To give someone the cold shoulder: to ignore someone, to refuse to speak with a person, to treat someone coldly:
Ever since they had that terrible argument, they´ve been giving each other the cold shoulder.
A cold fish: an unfriendly and unemotional person that shows no warmth:
Bob´s such a cold fish. He´s never showed he cares about anyone. No wonder he´s still single.
Out in the cold: not to have something everybody else already has.
Jane´s complained a lot because she thinks she´s the only one in the company who still hasn´t got a pay raise this year.