Etymology
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cosign (v.)

also co-sign, "to sign (a document) along with another or others," by 1944, from co- + sign (v.). Related: Cosigned; cosigning.

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Definitions of cosign

cosign (v.)
sign jointly;
Synonyms: co-sign
cosign (v.)
sign and endorse (another person's signature), as for a loan;
Synonyms: co-sign
From wordnet.princeton.edu