ALL meanings of cosign
co·sign
C c - verb cosign to sign (a document) jointly 3
- verb cosign 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 3
- verb transitive cosign to sign (a promissory note) in addition to the maker, thus becoming responsible for the obligation if the maker should default 3
- verb transitive cosign to sign jointly 3
- noun cosign To sign a document jointly with another person, sometimes as an endorsement. 1