Definition of “$64,000 question” - English Dictionary

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“$64,000 question” in British English

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$64,000 questionnoun [ C usually singular ]

uk /ˌsɪk.sti.fɔː ˌθaʊ.zəndˌdɒl.ə ˈkwes.tʃən/ us /ˌsɪk.sti.fɔːrˌθaʊ.zəndˌdɑː.lɚ ˈkwes.tʃən/ also million-dollar question

an important or difficult question on which a lot depends:

The $64,000 question is, can we repeat last year's success?

(Definition of “$64,000 question” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)