cosign

present singular third person cosigns · participle present cosigning · participle past cosigned · past cosigned · alternative co-sign

1. To sign a document jointly with another person, sometimes as an endorsement.
2. informaltransitiveTo agree with or endorse.

   [Ilhan] Omar was left twisting in the wind earlier this year after facing spurious charges of antisemitism, a display of Democratic cowardice co-signed by Chelsea Clinton, Chuck Schumer, and most every other Democrat with a congressional leadership position.

   2019 July 19, Noah Kulwin, “Democrats Fail the Left, Once Again”, in Jewish Currents

plural cosigns · alternative co-sign

1. The promotion of one musical artist (usually less successful) by another.

   Big pump, don't stunt when it's showtime / Kinda funny how I didn't need a cosign

   2017, Stormzy, Swifta Beater, “Cold” (track 15), in Gang Signs & Prayer, performed by Stormzy

   1 more example

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

   2013, Jesse Atkinson, The Independent Music Grind