Source : Webster's Revised Unabridged Dictionary (1913)

Undergo \Un`der*go"\, v. t. [imp. {Underwent}; p. p. {Undergone}
   (?; 115); p. pr. & vb. n. {Undergoing}.] [AS. underg[=a]n.
   See {Under}, and {Go}.]
   1. To go or move below or under. [Obs.]

   2. To be subjected to; to bear up against; to pass through;
      to endure; to suffer; to sustain; as, to undergo toil and
      fatigue; to undergo pain, grief, or anxiety; to undergothe
      operation of amputation; food in the stomach undergoes the
      process of digestion.

            Certain to undergo like doom.         --Milton.

   3. To be the bearer of; to possess. [Obs.]

            Their virtues else, be they as pure as grace, As
            infinite as man may undergo.          --Shak.

   4. To undertake; to engage in; to hazard. [Obs.]

            I have moved already Some certain of the
            noblest-minded Romans To undergo with me an
            enterprise.                           --Shak.

   5. To be subject or amenable to; to underlie. [Obs.]

            Claudio undergoes my challenge.       --Shak.