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English definition of “la-di-da”

la-di-da

adjective (also lah-di-dah)     /ˌlɑː.dɪˈdɑː/ old-fashioned informal
describes speech or behaviour that is not sincere because the person is pretending to belong to a higher social class Affected and insincere
(Definition of la-di-da adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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