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English definition of “undergo”

undergo

verb [T]     /ˌʌn.dəˈɡəʊ/ US  /-dɚˈɡoʊ/ (present participle undergoing, past tense underwent, past participle undergone)
C1 to experience something that is unpleasant or something that involves a change: She underwent an operation on a tumour in her left lung last year. Cinema in Britain is undergoing a revival of popularity.Experiencing and suffering
(Definition of undergo verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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