black operation

black op

noun
Often, black ops. a secret mission or campaign carried out by a military, governmental, or other organization, typically one in which the organization conceals or denies its involvement: Some national intelligence agencies use black ops to undermine enemy governments. The company even resorted to an industrial black op to steal secrets from its competitor.
Also, black operation.


Origin:
1940–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
black operation

noun
a covert operation not attributable to the organization carrying it out 
WordNet® 3.0, © 2006 by Princeton University.
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