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petit treason

or pet·ty trea·son

[pet-ee]
noun English Law.
  1. the killing of a husband by his wife, of a lord by his servant, or of an ecclesiastic by a subordinate ecclesiastic.
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Origin of petit treason

Borrowed into English from Anglo-French around 1490–1500
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018