co-sign

cosign

[koh-sahyn, koh-sahyn]
verb (used without object), verb (used with object)
to sign as a cosigner.

Origin:
co- + sign

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

cosign
also co-sign, by 1970, from co- + sign (v.). Co-signer (cosigner) is recorded from 1959; earlier in this sense was cosignatory (1865).
Online Etymology Dictionary, © 2010 Douglas Harper
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