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cosign

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

Origin of cosign

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for cosign

v.

also co-sign, by 1944, from co- + sign (v.). Related: Cosigned; cosigning.

Online Etymology Dictionary, © 2010 Douglas Harper