[1] : The Collaborative International Dictionary of English v.0.48

undergo \un`dergo"\, v. t. imp. underwent; p. p. undergone
   ?; 115; p. pr.  vb. n. undergoing. as. underg=an.
   see under, and go.
   1. to go or move below or under. obs.
      1913 webster

   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.
      1913 webster

            certain to undergo like doom.         --milton.
      1913 webster

   3. to be the bearer of; to possess. obs.
      1913 webster

            their virtues else, be they as pure as grace,
            as infinite as man may undergo.       --shak.
      1913 webster

   4. to undertake; to engage in; to hazard. obs.
      1913 webster

            i have moved already
            some certain of the noblest-minded romans
            to undergo with me an enterprise.     --shak.
      1913 webster

   5. to be subject or amenable to; to underlie. obs.
      1913 webster

            claudio undergoes my challenge.       --shak.
      1913 webster
see also:
underwent undergone undergoing under go 

[2] : WordNet (r) 2.0

undergo
     v 1: of mental or physical states or experiences; "get an idea";
          "experience vertigo"; "get nauseous"; "undergo a strange
          sensation"; "the chemical undergoes a sudden change";
          "the fluid undergoes shear"; "receive injuries"; "have a
          feeling" syn: experience, receive, have, get
     2: go or live through; "we had many trials to go through"; "he
        saw action in viet nam" syn: experience, see, go
        through
     3: accept or undergo, often unwillingly; "we took a pay cut"
        syn: take, submit
     also: underwent, undergone
see also:
experience receive have get see go through 
take submit underwent undergone 

[3] : Moby Thesaurus II by Grady Ward, 1.0

39 moby thesaurus words for "undergo":
   abide, afford, be exposed to, be subjected to, bear, bow, defer,
   encounter, endure, experience, feel, go through, have, know,
   labor under, live through, meet, meet up with, meet with,
   pass through, pay, run up against, see, spare, spare the price,
   spend, stand, stand under, submit, submit to, suffer, support,
   sustain, taste, tolerate, weather, well afford, withstand, yield

Undergo >> U Words
Undergo, definition of term: Undergo
undergo_pag1.html

Undergo Atrophy >> U Words
Undergo Atrophy, definition of term: Undergo Atrophy
undergo+atrophy_pag1.html