undergo

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”).

• Rhymes: -əʊ

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”, in 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.

• (to go or move under):
• (to experience): go through, take, undercome
• (to suffer or endure): brook, put up with; See also Thesaurus:tolerate

• undergang

• go under, grounde, guerdon, ungored