Mainprise

Part of speech: noun (n.)

1. 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. Wharton.

2. Deliverance of a prisoner on security for his appearance at a day.

Part of speech: verb (v.)

To suffer to go at large, on his finding sureties, or mainpernors, for his appearance at a day; -- said of a prisoner.