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A defensive tactic in an espionage trial whereby the accused threatens to reveal secret information unless the charges are dropped.

gray′mail′ v.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Law) law US a tactic to avoid prosecution in an espionage case by threatening to expose state secrets during trial
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


a means of preventing prosecution, as for espionage, by threatening to disclose government secrets during trial.
[1975–80; gray1 (in sense “indeterminate”) + (black)mail]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Chen, Note, The Graymail Problem Anew in a World Going Dark: Balancing the Interests of the Government and Defendants in Prosecutions Using Network Investigative Techniques (Nits), 19 COLUM.
Proofpoint comes equipped with granular filtering to manage bulk 'graymail' or
Under the agreement, Gulf Air will get Proofpoint Email Protection which stops malware and non-malware threats such as impostor email - also known as business email compromise, or BEC - and it provides granular filtering to control bulk 'graymail' and other unwanted email.
* Delve can automatically move "graymail" from your Outlook inbox to a clutter box (not junk mail, but less important email such as that newsletter you signed up for but seldom read).
graymail (15) and public resistance to prosecutions.