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From Middle English undergon, from Old English undergān (to undergo, undermine, ruin), equivalent to under- +‎ go. Cognate with Dutch ondergaan (to undergo, perish, sink), German untergehen (to perish, sink, undergo), Swedish undergå (to undergo, go through).



undergo (third-person singular simple present undergoes, present participle undergoing, simple past underwent, past participle undergone)

  1. (transitive) To experience; to pass through a phase.
    Synonyms: go through, take, undercome
    The project is undergoing great changes.
    • 2013 January 1, Paul Bartel, Ashli Moore, “Avian Migration: The Ultimate Red-Eye Flight”, in American Scientist[1], volume 101, number 1, archived from the original on 5 March 2016, pages 47–48:
      Many of these classic methods are still used, with some modern improvements. For example, with the aid of special microphones and automated sound detection software, ornithologists recently reported […] that pine siskins (Spinus pinus) undergo an irregular, nomadic type of nocturnal migration.
  2. (transitive) To suffer or endure; bear with.
    Synonyms: brook, put up with; see also Thesaurus:tolerate
    The victim underwent great trauma.
    She had to undergo surgery because of her broken leg.
  3. (transitive, obsolete) To go or move under or beneath.


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