undersign

American  

[uhn-der-sahyn, uhn-der-sahyn] / ˌʌn dərˈsaɪn, ˈʌn dərˌsaɪn /

verb (used with object)

1. to sign one's name under or at the end of (a letter or document); affix one's signature to.

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Etymology

Origin of undersign

First recorded in 1570–80; under- + sign