- to sign one's name under or at the end of (a letter or document); affix one's signature to.
Origin of undersign
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Related Words for undersignauthorize, acknowledge, initial, confirm, inscribe, subscribe, autograph, endorse, witness, ink, signature, rubber-stamp
Online Etymology Dictionary, © 2010 Douglas Harper