Definition of the sixty-four thousand dollar question noun from the Oxford Advanced Learner's Dictionary

 

the sixty-four thousand dollar question

 noun
noun
BrE
 
; NAmE
 
(informal)
 
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the thing that people most want to know, or that is most important It’s a clever plan, but the sixty-four thousand dollar question is: will it work? From the name of a US television show which gave prizes of money to people who answered questions correctly. The correct answer to the last question was worth $64 000.
See the Oxford Advanced American Dictionary entry: the sixty-four thousand dollar question