You can make up any idiom or slang that you want to! Here's a link to some real idioms so you can get an idea of what they look like.
Hang in there!
It made me laugh very much.
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The idiom "bone up" means to study intensively or improve one's understanding of a subject. In this context, it means that he made an effort to enhance his vocabulary before the test by studying diligently.
A good idiom would be "sitting on the fence."
The meaning of the idiom in the pink of health means being in good health.
"Life is just a bowl of cherries" is a popular idiom that at one point was made into a song. It simply means that life is good and everything is going great!
An idiom that means surrender is to "wave the white flag." A closely related idiom is to "throw in the towel" which means to give up."
Also, for good and all. Permanently, forever. .
A quill was a pen made from the feather of a large bird. To say "Pick up your quill" means start writing.
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.
to laugh is 'rire' in French,and the idiom 'to laugh up is sleeve' is 'rire sous cape'.