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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, obsolete) To go or move under or beneath.
  2. (transitive) To experience; to pass through a phase.
    • 2013 January 1, Paul Bartel, Ashli Moore, “Avian Migration: The Ultimate Red-Eye Flight”, American Scientist, volume 101, number 1, page 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.
    The project is undergoing great changes.
  3. (transitive) To suffer or endure; bear with.
    The victim underwent great trauma.
    She had to undergo surgery because of her broken leg.