Lewis Short
(verb) : pignĕro, āvi, ātum, 1, pignus
* To give as a pledge, to pledge, pawn, mortgage.
* Lit.: unionem,Suet. Vit. 7: bona tantum, quae publicari poterant, pigneranda poenae praebebant, furnished as security for the penalty, i. e. left to be confiscated, Liv. 29, 36: cujus et alveolos et laenam pignerat Atreus,which the poet Rubrenus, while he was writing the Atreus, was compelled by necessity to pawn,Juv. 7, 73: ancilla pignerata,Dig. 40, 5, 46: vestimenta pignorata,Vulg. Amos, 2, 8.
* Trop.
* To pledge one's life, etc.: velut obsidibus datis pigneratos habere animos,Liv. 24, 1.
* To bind a person or thing to one's self, to make one's own: pignerare aliquem sibi beneficio,App. M. 3, p. 134, 32: optimates viros curiae suae, Naz. Pan. ad Const. 35.—With se, to pledge one's self: se cenae alicujus,to promise to dine with one,App. M. 3, p. 139, 4; 11, p. 269, 25.
Charlton T. Lewis, Charles Short, A Latin Dictionary