undergoing, present participle; undergone, past participle; undergoes, 3rd person singular present; underwent, past tense;
Experience or be subjected to (something, typically something unpleasant, painful, or arduous)
the baby underwent a life-saving brain operation
(undergo) pass through; "The chemical undergoes a sudden change"; "The fluid undergoes shear"; "undergo a strange sensation"
Operation Undergo was the 3rd Canadian Infantry Division's operation to take the fortified French port of Calais in September, 1944. A subsidiary operation was executed to silence and capture the heavy batteries at Cap Gris Nez, which threatened the sea approaches to Boulogne.Stacey
(undergo) To go or move under or beneath; To experience; to pass through a phase; To suffer or endure; bear with
(undergo) v. experience or endure (sth unpleasant or painful)