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The Collaborative International Dictionary
Impignorate

Impignorate \Im*pig"no*rate\ ([i^]m*p[i^]g"n[-o]*r[=a]t), v. t. [LL. impignoratus, p. pl of impignorare to pawn. See Pignoration.] To pledge or pawn. [Obs.]
--Laing.

Wiktionary
impignorate

vb. (context obsolete transitive English) To pledge or pawn.