It's not an idiom because it means just what it looks like - someone is very cold. In this context, you would think of the alternate meaning of cold, which is unemotional or unapproachable. When you see "as ___ as ___" or "___er than ___" you are dealing with a simile.
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.
It can mean to eat a huge amount, more than you normally would.
"Larger than life" is an idiom, so there isn't an idiom for it.
The idiom "colder than a well digger's ass" is a humorous way to describe extremely cold weather. It evokes the image of a well digger working underground, where temperatures can be particularly frigid, especially in winter. The phrase emphasizes the intensity of the cold, often used in a light-hearted or exaggerated manner. It's a colorful expression that captures the discomfort of chilliness.
Meaning you are pretending to be bigger or smarter than you really are
I don't know if's jupiter is hotter or colder than eath
Think about this and you can figure it out. An idiom is something that SEEMS to mean something totally different than what it does. Does this phrase mean exactly what it says? Yes, it means that someone is as pretty as a princess. If you see the words "like" or "as" or "than" you're looking at a simile.
together mean something different than when they are used separately
I don't know what you mean by "common phrases of," but the idiom "over and above" just means "more than what was agreed upon."
Its cold...
This is not an idiom. The idiom is "her BARK is worse than her bite" which is a dog reference meaning that she and the dog make a lot of noise but aren't really dangerous. This sentence seems to mean that she has an injured shoulder which is worse than a bite that she also has.
The idiom "shell out" means to pay a sum of money, usually unwillingly or with reluctance. It implies spending money on something, often more than anticipated or desired.