Definition of the $64,000 question noun from the Oxford Advanced American Dictionary

 

the $64,000 question

 noun
noun
NAmE//ðə ˌsɪksti fɔr ˌθaʊznd ˌdɑlər ˈkwɛstʃən//
 
(informal)
 
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the thing that people most want to know, or that is most important It's a great plan, but the $64,000 question is: Will it work? From the name of a U.S. television show of the 1950s that gave prizes of money to people who answered questions correctly. The correct answer to the last question was worth $64,000. (The original term was the $64 question, from a radio show of the 1940s, in which the top prize was $64.)