The verb undergo has 3 senses (first 3 from tagged texts)
1. (13) experience, receive, have, get, undergo -- (go through (mental or physical states or experiences); "get an idea"; "experience vertigo"; "get nauseous"; "undergo a strange sensation"; "The chemical undergoes a sudden change"; "The fluid undergoes shear"; "receive injuries"; "have a feeling")
2. (8) experience, undergo, see, go through -- (go or live through; "We had many trials to go through"; "he saw action in Viet Nam")
3. (3) take, undergo, submit -- (accept or undergo, often unwillingly; "We took a pay cut")