1. Sign and endorse (another person's signature), as for a loan
   - co-sign 
2. Sign jointly
   - co-sign

Sounds like: cosine, co-sign

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

See also: cosigner

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

Encyclopedia: Cosign

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