simple past tense of undergo.
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verb (used with object), underwent, undergone, undergoing.
to be subjected to; experience; pass through: to undergo surgery.
to endure; sustain; suffer: to undergo sustained deprivation.

before 1000; Middle English undergon, Old English undergān. See under-, go1

undergoer, noun

1. See experience. 2. bear, tolerate.

1. avoid.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
undergo (ˌʌndəˈɡəʊ)
vb , -goes, -going, -went, -gone
(tr) to experience, endure, or sustain: to undergo a dramatic change of feelings
[Old English: earlier meanings were more closely linked with the senses of under and go]

underwent (ˌʌndəˈwɛnt)
the past tense of undergo

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

O.E. undergan "undermine," from under + gan (see go). Cf. M.Du. ondergaen, O.H.G. untarkun, Ger. untergehen, Dan. undergaa. Sense of "submit to, endure" is attested from c.1300. Meaning "to pass through" (an alteration, etc.) is attested from 1634.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He clearly underwent a conversion of sorts, and he's now a firm believer in
  online learning.
For that investigation, the patients underwent detailed psychological
  evaluations before enrolling.
Fifty-one psychologically healthy volunteers underwent two to five experimental
  sessions that lasted eight hours.
The hostages underwent severe emotional difficulties.
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