income earned surreptitiously or illegally, usually in cash, and not reported to the government so as to avoid paying taxes on it.
Origin of black money
First recorded in 1965–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
that part of a nation's income that relates to its black economy
any money that a person or organization acquires illegally, as by a means that involves tax evasion
US 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