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graymail

[grey-meyl]
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noun
  1. a means of preventing prosecution, as for espionage, by threatening to disclose government secrets during trial.

Origin of graymail

1975–80; gray1 (in sense “indeterminate”) + (black)mail
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
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