Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

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

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

co- +‎ sign

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