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la-la land

noun
 
 
/ˈlɑː.lɑːˌlænd/ informal

Definition

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 noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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