Lewis Short
(verb) : oppignĕro (obp-), āvi, ātum, 1, ob-pignero
* To give as a pledge, to pledge, pawn (rare but class.).
* Lit.: libelli pro vino etiam saepe oppignerabantur,Cic. Sest. 51, 110: anulum,Mart. 2, 57, 7.
* Trop.: filiam. Ter. Heaut. 4, 5, 46: verbo se oppignerare,Sen. Ben. 3, 5, 2.
Charlton T. Lewis, Charles Short, A Latin Dictionary