undergo Definition in the Cambridge English Dictionary
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Definition of “undergo” - English Dictionary

Definition of "undergo" - American English Dictionary

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undergoverb [T]

 us   /ˌʌn·dərˈɡoʊ/ (present tense undergoes, present participle undergoing, past tense underwent  /ˌʌn·dərˈwent/ , past participle undergone  /ˌʌn·dərˈɡɔn, -ˈɡɑn/ )
to ​experience something that is ​unpleasant or has a ​strongeffect: He ​recently underwent ​heartbypasssurgery.
(Definition of undergo from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "undergo" - British English Dictionary

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undergoverb [T]

uk   /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 ​leftlung last ​year. Playing ​boardgames is undergoing a ​revival in ​popularity.
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(Definition of undergo from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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