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English definition of “la-la land”

la-la land

noun uk   /ˈlɑː.lɑːˌlænd/ informal us  
be/live in la-la land to think that things that are completely impossible might happen, rather than understanding how things really areHoping and hopefulnessPotentialUnreal things and unreality
(Definition of la-la land from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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