This is not an idiom. When you see AS ___ AS ___ you are dealing with A Simile. They are comparing the temperature to a witch's supposedly cold body.
You seem to be asking about a distorted version of the idiom "on cloud nine" meaning, extremely happy (cloud nine being a cloud in heaven, or something like that).
Yes
meaning a person without no mercy to others and a person that mercy to others.
It should be witches'. Example: Witches' brooms
The term "cold turkey" (cold-turkey) means a sudden, complete, unsupported withdrawal from addictive substances (e.g. smoking) or addictive behavior (e.g. gambling). The inclusion of counseling services (e.g. Whatever Anonymous) may or may not invalidate the connotation of "cold turkey."
The phrase "colder than a witch's tit" is an idiom that likely originated from the association of witches with cold and supernatural elements in folklore. It is a humorous way to describe extremely cold weather.
meaning of cold war
"Catching a cold" is an idiom - it means to come down with the symptoms of the cold virus.
No, "As ____ as ____" is always the formula for a simile, a comparison of two thing to each other.
"Cold-blooded" means lacking emotion or feeling, such as a cold-blooded killer.
get scared or terrified
I think I am catching a cold.Do you think you are catching a cold?
"Tom was feeling under the weather after catching a cold."
Are You Referring To The Idiom....? ...Or An Actual Medical Health Concern?
Its cold...
You can say "gave the cold shoulder," which means they pretended not to see someone.
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.