Meaning of sixty-four thousand dollar question in English:

sixty-four thousand dollar question

noun

informal
  • Something that is not known and on which a great deal depends.

    ‘That has become the perennial sixty-four thousand dollar question.’
    ‘The sixty-four thousand dollar question now is what will be the Bush administration's response?’

Origin

1940s originally sixty-four dollar question, from a question posed for the top prize in a broadcast quiz show.

Pronunciation

sixty-four thousand dollar question