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black money

American  

noun

  1. income earned surreptitiously or illegally, usually in cash, and not reported to the government so as to avoid paying taxes on it.


black money British  

noun

  1. that part of a nation's income that relates to its black economy

  2. any money that a person or organization acquires illegally, as by a means that involves tax evasion

  3. money to fund a government project that is concealed in the cost of some other project

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of black money

First recorded in 1965–70