cosign

• co-sign

co- +‎ sign

• (UK) IPA^(key): /ˈkəʊ.saɪn/
• (US) IPA^(key): /ˈkoʊ.saɪn/
• Homophone: cosine

• Audio (US)

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• Audio (UK)

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cosign (third-person singular simple present cosigns, present participle cosigning, simple past and past participle cosigned)

1. To sign a document jointly with another person, sometimes as an endorsement.
2. (African American Vernacular, slang) To agree with or endorse

• cosignatory

cosign (plural cosigns)

1. The promotion of one musical artist (usually less successful) by another.
   • 2013, Jesse Atkinson, The Independent Music Grind

     Also, you can't base your entire career on cosigns and big features. At some point, your music has to stand on its own.

• Scogin, coigns, cosing, incogs