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The Collaborative International Dictionary
Mainprised

Mainprise \Main"prise\, v. t. [imp. & p. p. Mainprised; p. pr. & vb. n. Mainprising.] (Law) To suffer to go at large, on his finding sureties, or mainpernors, for his appearance at a day; -- said of a prisoner.

Wiktionary
mainprised

vb. (en-past of: mainprise)