Undergo

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Old English undergān ‘undermine’ (see under-, go1).

wiktionary

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From Middle English undergon, from Old English undergān(“to undergo, undermine, ruin”), equivalent to under- +‎ go. Cognate with Dutch ondergaan(“to undergo, perish, sink”), German untergehen(“to perish, sink, undergo”), Swedish undergå(“to undergo, go through”).

etymonline

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undergo (v.)

Old English undergan "obtain, get; undertake," from under + gan (see go (v.)). Compare similarly formed Middle Dutch ondergaen, Old High German untarkun, German untergehen, Danish undergaa. Sense of "submit to, endure" is attested from c. 1300. Meaning "to pass through" (an alteration, etc.) is attested from 1630s. Related: Undergone; underwent.