cosigner

[ koh-sahy-ner, koh-sahy- ]
/ ˈkoʊˌsaɪ nər, koʊˈsaɪ- /
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noun

a cosignatory.
a joint signer of a negotiable instrument, especially a promissory note.

Origin of cosigner

First recorded in 1900–05; co- + signer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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