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undersign

[uhn-der-sahyn, uhn-der-sahyn]
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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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Origin of undersign

First recorded in 1570–80; under- + sign
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for undersign

v.

1570s, from under + sign (v.). Related: Undersigned; undersigning.

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Online Etymology Dictionary, © 2010 Douglas Harper