LATIN DICTIONARYLexicon Latīnum
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“pledge” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

pledge s.
pignus, -oris, neuter (PROP. and figuratively): hypotheca (especially of immovables; pignus, of movables): fiducia (something of which the creditor takes actual possession, but under a promise to restore it on payment of the debt): arrhabo, arrha (earnest). To give a pledge, pignus dare: to take a pledge, pignus capere, auferre: to redeem a pledge, liberare pignus a creditore; reddere pecuniam, or pignus accipere: a pledge of love or esteem, pignus amoris, voluntatis, benevolentiae.
pledge v.
pignori dare, obligare, or opponere; pignerare; oppignerare. To pledge one thing for another, aliquid pro aliqua re oppignerare: to pledge one’s self, se pignori opponere (PROP.); se oppignerare (PROP. or figuratively); animum pignerare (figuratively). To pledge one’s self, fidem obligare in aliquid (to pledge his word): spondere aliquid (to promise in due form, and with obligation; also, absolutely): to pledge one’s self by an oath, sacramento se obstringere: to pledge another by oath, sponsione aliquem obstringere or obligare; stipulatione alligare aliquem: to pledge one’s self regularly to anything (to promise in a contract), stipulari aliquid: to pledge one’s self to anything in return, restipulari aliquid.

Quick answer

What is the Latin word for pledge?
The usual Latin words for “pledge” are pignus, hypothēca, fīdūcia; also arrhabō, arrha, auferō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.