Mainprise
A Law Dictionary and Glossary · George C. Kinney · 1893
A Law Dictionary and Glossary
meynprise, maynpryse, mainpris, meynpris, I. fr. and eng.
In old English law
The release of a person under arrest into the custody of his friends upon their giving security for his appearance: a writ of mainprise directed to the sheriff ordering him to take mainpernors and set the prisoner at liberty; security for debt