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]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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
Jobs was urged to undergo an operation to remove it.
If you're a mid-career professor about to undergo your first post-tenure
  review, you're probably wondering what to expect.
The region is about to undergo a great transformation.
Students learn that animals undergo adaptations-changes to body parts and
  behaviors-that help them survive.
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