/ ˌʌndəˈgəʊ; NAmE ˌʌndərˈgoʊ/ verb
( under·went / -ˈwent; NAmE / under·gone / -ˈgɒn; NAmE -ˈgɔːn; -ˈgɑːn/) [ vn ] to experience sth, especially a change or sth unpleasant :
to undergo tests / trials / repairs
My mother underwent major surgery last year.
Some children undergo a complete transformation when they become teenagers.
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WORD ORIGIN
Old English undergān undermine (see under- , go ).