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.] 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. Certain to undergo like doom. --Milton. 3. To be the bearer of; to possess. [Obs.] Their virtues else, be they as pure as grace, As infinite as man may undergo. --Shak. 4. To undertake; to engage in; to hazard. [Obs.] I have moved already Some certain of the noblest-minded Romans To undergo with me an enterprise. --Shak. 5. To be subject or amenable to; to underlie. [Obs.] Claudio undergoes my challenge. --Shak.