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Verb: cosign
  1. Sign jointly
    "Husband and wife cosigned the lease";
    - co-sign
     
  2. Sign and endorse (another person's signature), as for a loan
    - co-sign

Sounds like: cosine, co-sign

Derived forms: co-signs, cosigning, co-signed, cosigns, cosigned, co-signing

Type of: endorse, formalise [Brit], formalize, indorse, validate

Encyclopedia: Cosign