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English definition of “cloud cuckoo land”

cloud cuckoo land

uk   /ˌklaʊdˈkʊk.uː.lænd/ disapproving us  
live/be in cloud cuckoo land to think that things that are completely impossible might happen, rather than understanding how things really are: When referees make contentious decisions players are going to be upset, and anyone who thinks otherwise is living in cloud cuckoo land.Unreal things and unreality
(Definition of cloud cuckoo land from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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