un ‧ der ‧ go AC /ˌʌndəˈɡəʊ $ ˌʌndərˈɡoʊ/ BrE AmE verb ( past tense underwent /-ˈwent/, past participle undergone /-ˈɡɒn $ -ˈɡɒːn/) [transitive not in passive]
if you undergo a change, an unpleasant experience etc, it happens to you or is done to you:
The country has undergone massive changes recently.
He has been released from prison to undergo medical treatment in the United States.
She has been undergoing tests since Monday.
Teachers should be expected to undergo mid-career training and development.
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COLLOCATIONS
■ nouns
▪ undergo a change
The equipment has undergone several important design changes in recent years.
▪ undergo a transformation (=change completely)
After the accident, his personality underwent a complete transformation.
▪ undergo treatment/surgery/an operation
The cyclist underwent emergency surgery yesterday after a collision with a car.
▪ undergo tests/trials
He is undergoing tests for pneumonia.
▪ undergo training
Doctors have to undergo years of training.
▪ undergo repairs/restoration
The ship is currently undergoing extensive repairs.
▪ undergo questioning/interrogation (=answer questions from the police)
Mrs White underwent 20 hours of questioning, and admitted nothing.