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$64,000 question

noun [C usually singular]
 
 
/ˌsɪk.sti.fɔːrˌθaʊ.zəndˌdɑː.lɚˈkwes.tʃən/ (also million-dollar question)

Definition

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

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