from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To sign (a document) jointly.
  • transitive v. To endorse (another's signature), as for a loan.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To sign a document jointly with another person, sometimes as an endorsement.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. sign jointly
  • v. sign and endorse (another person's signature), as for a loan


co- +‎ sign (Wiktionary)



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