cosign

Definitions

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

Equivalents

Examples

“[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.”

CEFR level