'undergo' originates from Old English, specifically the verb 'undergān', where the prefix 'under-' meant 'beneath/under' and 'gān' meant 'to go'.

'undergo' changed from Middle English forms such as 'undergon'/'undergo' (from Old English 'undergān') and eventually became the modern English word 'undergo'.

Initially, it meant 'to go under or beneath', but over time it evolved into its current meaning of 'to experience, endure, or be subjected to (something)'.