un·der·go

[uhn-der-goh]
verb (used with object), un·der·went, un·der·gone, un·der·go·ing.
1.
to be subjected to; experience; pass through: to undergo surgery.
2.
to endure; sustain; suffer: to undergo sustained deprivation.

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

un·der·go·er, noun


1. See experience. 2. bear, tolerate.


1. avoid.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
undergo (ˌʌndəˈɡəʊ) [Click for IPA pronunciation guide]
 
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]
 
'undergoer
 
n

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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00:10
Undergo is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a gadget; dingus; thingumbob.
Etymonline
Word Origin & History

undergo
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
Universities evolve over time and quite naturally undergo periods of rapid
  change, punctuated by slower growth or even stasis.
From the platinum-plated premium-fare payer to the rock-bottom budget
  traveller, everyone has to undergo it.
Former militiamen showing promise as future leaders undergo a programme of
  religious study.
Students learn that animals undergo adaptations-changes to body parts and
  behaviors-that help them survive.
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