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cosign

[koh-sahyn, koh-sahyn] /ˈkoʊˌsaɪn, koʊˈsaɪn/
verb (used with or without object)
1.
to sign as a cosigner.
Origin of cosign
co- + sign
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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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
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