(1):

(v. t.) To go or move below or under.

(2):

(v. t.) 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.

(3):

(v. t.) To be the bearer of; to possess.

(4):

(v. t.) To undertake; to engage in; to hazard.

(5):

(v. t.) To be subject or amenable to; to underlie.