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English definition of “$64,000 question”

$64,000 question

noun [C usually singular] uk   /ˌsɪk.sti.fɔːrˌθaʊ.zəndˌdɑː.lɚˈkwes.tʃən/ (also million-dollar question) us  
an important or difficult question on which a lot depends: The $64,000 question is, can we repeat last year's success?Questioning people and asking questions in generalCuriositySuspecting and questioning
(Definition of $64,000 question from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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