Authors use idioms and slang for the same reason anybody else does -- to make things more interesting.
An idiom misuse is to use and idiom in a wrong way that doesn't make sense.
That nightclub used to be great , but it ` s reallygone to the dogs .
"Head over heels in love" would be one idiom.
It is an idiom, because it does not use the term "like" or "as".
"A pain in the neck" is an idiom meaning an annoying person or situation. You would use this idiom to describe a person whose behavior is irritating you, or for anything that is annoying. Betty can be a real pain in the neck sometimes.This extra paperwork is really a pain in the neck.
A good idiom would be "sitting on the fence."
no an idiom would be like "it's raining cats and dogs"
Will you eat of the forbidden fruit?
under what headword would you find the idiom raining cats and dogs?
An idiom is a saying or expression. There are many idioms that mean to stay away from, or avoid, someone. An example of such an idiom would be, "to steer clear of" someone.
I cannot find an idiom that starts off "she cried tears." When you cry, you cry tears, so that would not be a good idiom anyway.
The idiom, at sixes and sevens means that you are in a state of panic, confusion and uncertainty. You could use this idiom in a sentence by saying, she was at sixes and sevens as to whether or not to tell her best friend that her husband was being unfaithful.