Meaning of “undergo” - Learner’s Dictionary

undergo

verb [ T ] uk us /ˌʌndəˈɡəʊ/ (present participle undergoing, past tense underwent, past participle undergone)

to experience something, especially a change or medical treatment:

He is undergoing surgery for a heart problem.

(Definition of “undergo” from the Cambridge Learner’s Dictionary © Cambridge University Press)