Proper noun
Law French
(law) The body of legal terms used in the United Kingdom descended from the Anglo-Norman dialect of Old French, many now archaic but some still in use in the UK and elsewhere.
A plea of "autrefois convict" ( Law French for "previously convicted") is one in which the defendant claims to have been previously convicted of the same offence and that he or she therefore cannot be tried for it again. Source: Internet
By the mid-15th century, Chancery Standard was used for most official purposes except by the Church, which still used Latin, and for some legal purposes, for which Law French and some Latin were used. Source: Internet
Francophones use plat de résistance (main dish). ; succès de scandale : "Success through scandal"; Francophones might use succès par médisance. ; voir dire : a trial within a trial, or (in America) jury selection ( Law French ). Source: Internet