mainprize
/ˈmeɪnprʌɪz/(also mainprise) Law. Now historical
noun
The action of procuring the release of a prisoner on someone's undertaking to stand surety (‘mainpernor’) for his or her appearance in court at a specified time. Chiefly in phrases to let (also receive) to (also in) mainprize, to deliver upon (also by) mainprize, to nim under mainprize. without bail or mainprize: with no permission to obtain release by finding sureties.
Origin
Middle English; earliest use found in Statutes of the Realm. From Anglo-Norman mainprise, meinprise from mainprendre.