What is the common idiomatic saying for get the cold shoulder?

Your question does not quite make sense as stated. The phrase "get the cold shoulder" is an idiom, so there is no point in asking what is the idiom for it. You might want to know what it means, however. To give someone the cold shoulder is to socially reject or ostracize that person, to refuse to speak to that person. When you turn away from someone, they will then be facing your shoulder rather than your face, that is the origin of the idiom.