particeps criminis

English

Etymology

From Latin particeps +‎ crīminis, literally “participant in the crime”.

Noun

particeps criminis (plural particeps criminis or particepes criminis)

1. (law) An accomplice in crime; an accessory. [from 17th c.]
   • 1968, Charles Portis, True Grit:

     “I have heard too that he was particeps criminis in some road-agent work before he came here and attached himself to the courthouse.”