'Undergo' definitions:

Definition of 'undergo'

verb

Pass through; "The chemical undergoes a sudden change"; "The fluid undergoes shear"; "undergo a strange sensation"

From: GCIDE

Undergo \Un`der*go"\, v. t. [imp. Underwent; p. p. Undergone (?; 115); p. pr. & vb. n. Undergoing.] [AS. underg[=a]n. See Under, and Go.]
1. To go or move below or under. [Obs.] [1913 Webster]
2. To be subjected to; to bear up against; to pass through; to endure; to suffer; to sustain; as, to undergo toil and fatigue; to undergo pain, grief, or anxiety; to undergothe operation of amputation; food in the stomach undergoes the process of digestion. [1913 Webster]
Certain to undergo like doom. --Milton. [1913 Webster]
3. To be the bearer of; to possess. [Obs.] [1913 Webster]
Their virtues else, be they as pure as grace, As infinite as man may undergo. --Shak. [1913 Webster]
4. To undertake; to engage in; to hazard. [Obs.] [1913 Webster]
I have moved already Some certain of the noblest-minded Romans To undergo with me an enterprise. --Shak. [1913 Webster]
5. To be subject or amenable to; to underlie. [Obs.] [1913 Webster]
Claudio undergoes my challenge. --Shak. [1913 Webster]