( BrE ) ( NAmE cloud·land , ˈla-la land ) noun
[ U ] ( informal , disapproving ) if you say that sb is living in cloud-cuckoo-land , you mean that they do not understand what a situation is really like, but think it is much better than it is
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WORD ORIGIN
late 19th cent.: translation of Greek Nephelokokkugia , the name of the city built by the birds in Aristophanes' comedy Birds , from nephelē cloud + kokkux cuckoo.