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.

Entries linking to cosign

co- 

in Latin, the form of com- "together, with" in compounds with stems beginning in vowels, h-, and gn-; see com-. Taken in English from 17c. as a living prefix meaning "together, mutually, in common," and used promiscuously with native words (co-worker) and Latin-derived words not beginning with vowels (codependent), including some already having it (co-conspirator).

sign (v.)
c. 1300, "to make the sign of the cross," from Old French signier "to make a sign (to someone); to mark," from Latin signare "to set a mark upon, mark out, designate; mark with a stamp; distinguish, adorn;" figuratively "to point out, signify, indicate," from signum "identifying mark, sign" (see sign (n.)). Sense of "to mark, stamp" is attested from mid-14c.; that of "to affix one's name" is from late 15c. Meaning "to communicate by hand signs" is recorded from 1700. Related: Signed; signing.
cosigner (n.)

also co-signer, "one who unites with another or others in signing a treaty, etc.," 1946, agent noun from cosign. Earlier in this sense was cosignatory (1851).

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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

Dictionary entries near cosign

Cosa Nostra

cose

cosecant

cosh

cosher

cosign

cosigner

cosily

cosine

cosmetic

cosmetologist

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