Oppignero, oppígneras, pen. cor. oppignerâre. Martial. To lay in pledge: or lay to gage.Libelli pro vino etiam sæpe oppignerabantur.Cic.Oppignerare se. Sen.
Lewis and Short: Latin dictionary
oppignĕro (obp-), āvi, ātum, 1, v. a. [ob-pignero], to give as a pledge, to pledge, pawn (rare but class.). I.Lit.: libelli pro vino etiam saepe oppignerabantur, Cic. Sest. 51, 110: anulum, Mart. 2, 57, 7.—II.Trop.: filiam. Ter. Heaut. 4, 5, 46: verbo se oppignerare, Sen. Ben. 3, 5, 2.