What is the meaning of to cry for moon in idioms?

The idiom "to cry for the moon" is not a common idiom in English. It's possible that you've misheard or misremembered a similar idiom.

Here are a few idioms that might be what you're thinking of:

* "To reach for the moon" - This idiom means to aim high, to set ambitious goals, even if they seem impossible.

* "To ask for the moon" - This idiom means to make an unreasonable or impossible request.

* "The moon is made of green cheese" - This idiom means something is completely impossible or absurd.

Could any of these idioms be what you're looking for? If you can provide more context, I might be able to help you find the specific idiom you're thinking of.