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Definition of black hole noun from the Oxford Advanced American Dictionary

black hole

noun
black hole pronunciation American
 
an 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
(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).(figurative)Thousands of people have been plunged into the black hole of unemployment.