Etymology
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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.

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Definitions of undergo

undergo (v.)
pass through;
undergo a strange sensation
From wordnet.princeton.edu