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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 black hole in the Oxford Advanced Learner's Dictionary
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