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Definition of cloud cuckoo land noun from the Oxford Advanced Learner's Dictionary

cloud cuckoo land

noun
 
/ˌklaʊd ˈkʊkuː lænd/
 
/ˌklaʊd ˈkʊkuː lænd/
(British English)
(North American English la-la land)
[uncountable] (informal, disapproving)
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  1. if you say that somebody 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
    • Anyone who thinks this legislation will be effective is living in cloud cuckoo land.
    Word Originlate 19th cent.: translation of Greek Nephelokokkugia, the name of the city built by the birds in Aristophanes' comedy Birds, from nephelē ‘cloud’ + kokkux ‘cuckoo’.

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