black hole - definition and synonyms

noun [countable] 

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singularblack hole
pluralblack holes
  1. 1
    astronomy an area in outer space where the force of gravity is so strong that light and everything else around it is pulled into it
  2. 2
    informal a situation in which large amounts of money are spent without bringing any benefits

    The business was little more than a financial black hole.

  3. 3
    informal a situation in which there is a lot of sadness and very little hope