Mainprise :: Mainprise (n.) A writ directed to the sheriff, commanding him to take sureties, called mainpernors, for the prisoner's appearance, and to let him go at large. This writ is now obsolete..
Mainprise :: Mainprise (n.) Deliverance of a prisoner on security for his appearance at a day.
Mainprise :: Mainprise (v. t.) To suffer to go at large, on his finding sureties, or mainpernors, for his appearance at a day; -- said of a prisoner..