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to sign a document jointly with another; to endorse, as for a mortgage: his father cosigned the loan on his new car
Not to be confused with:
cosine – a mathematical term
Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree


tr.v. co·signed, co·sign·ing, co·signs
1. To sign (a document) jointly.
2. To endorse (another's signature), as for a loan.

co·sign′er n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (tr) to sign (a document) jointly
2. (Banking & Finance) (intr) banking to sign a document that has already been signed by a borrower of money, declaring that, should the borrower be unable to repay that money, the signer will repay the amount due
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈkoʊˌsaɪn, koʊˈsaɪn)

v.i., v.t.
to sign as a cosigner.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Verb1.cosign - sign jointly; "Husband and wife co-signed the lease"
validate, formalise, formalize - declare or make legally valid
2.cosign - sign and endorse (another person's signature), as for a loan
endorse, indorse - sign as evidence of legal transfer; "endorse cheques"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
"The NPS has stopped direct stock trading through Samsung Securities, and will also decide whether to stop its cosigned stock trading with the brokerage based on the results of the financial authorities' inspection."
Adil al-Sharif, Advisor of the IDB President for Palestine Trust Funds, cosigned the agreement.
For example, if you appear to owe thousands of dirhams for a loan that you cosigned and now in some trouble, you're less likely to get a loan yourself to pay a car or finance a home.
The Jesuit university, whose president cosigned a letter in support of the Development, Relief, and Education for Alien Minors (DREAM) Act, also pledged to not deny students admission based on immigration status.
THE Remote Gambling Association has submitted a legal challenge to the Greek council of state, cosigned by bet365, Betfair and William Hill, over the country's new taxation regime for online gambling.
Drummey was a co-owner of the Falmouth property and cosigned the mortgage loan, but an investigation by the Boston Globe found the documents were in fact solely in the names of Mr.