petit treason

or pet·ty trea·son

[ pet-ee ]
/ ˈpɛt i ˈtri zən /

noun English Law.

the killing of a husband by his wife, of a lord by his servant, or of an ecclesiastic by a subordinate ecclesiastic.

Origin of petit treason

Borrowed into English from Anglo-French around 1490–1500 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019