cry for the moon
US /kraɪ fɔr ðə mun/
UK /kraɪ fɔr ðə mun/

1.
痴心妄想, 异想天开
to ask for something that is impossible or very difficult to obtain
:
•
You're crying for the moon if you think you can finish this entire project by yourself in one day.
如果你认为你可以在一天内独自完成整个项目,那简直是痴心妄想。
•
Getting a promotion without any experience is like crying for the moon.
没有任何经验就想升职,简直是痴心妄想。