ask for the moon
Verb
Meaning
ask for the moon (third-person singular simple present asks for the moon, present participle asking for the moon, simple past and past participle asked for the moon)
(idiomatic) To claim or desire something that one cannot have.
Examples
Oh, don't let's ask for the moon. We've already got the stars.
As long as the sun shines one does not ask for the moon.