a joint signer of a negotiable instrument, especially a promissory note.
Origin of cosigner
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for cosigner
Contemporary Examples of cosigner
A cosigner of her loans, her father had also been using home equity loans to pay some of her college bills.NYU Professor: Are Student Loans Immoral?
September 27, 2012
also co-signer, 1946, agent noun from cosign; earlier in this sense was cosignatory (1865).
Online Etymology Dictionary, © 2010 Douglas Harper