[cry] for the moon

to desire what cannot be achieved

The phrase "cry for the moon" is an idiom that means to make an unreasonable or extravagant request or demand, often one that is unattainable or impractical. The origin of this expression can be traced back to the idea that crying for the moon, a celestial body out of reach, is akin to asking for something impossible.

Asking for a raise right after starting a new job is like crying for the moon; you need to prove your worth first.
His wish for a private jet for his birthday is nothing more than crying for the moon; it's far beyond their budget.
Wanting a perfect relationship without any disagreements is like crying for the moon; conflicts are a part of every relationship.
The customer's demand for a custom-made item within an hour is crying for the moon; it's impossible to produce in such a short time.
Hoping for a complete overhaul of the healthcare system without any financial consequences is like crying for the moon; it's a complex issue with no easy solution.