Definition of black hole noun from the Oxford Advanced American Dictionary

     

    black hole

     noun
    noun
     
     
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  1. 1an area in space that nothing, not even light, can escape from, because gravity (= the force that pulls objects in space toward each other) is so strong there
  2. 2(figurative) The company viewed the venture as a financial black hole (= it would use a lot of the company's money with no real result).
  3. 3(figurative) Thousands of people have been plunged into the black hole of unemployment.
See the Oxford Advanced Learner's Dictionary entry: black hole

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