'enlist' originates from Old French, specifically the word 'enlister,' where 'en-' meant 'in' and 'lister' meant 'to list or enroll.'

'enlister' transformed into the Middle English word 'enlisten,' and eventually became the modern English word 'enlist.'

Initially, it meant 'to enroll in a list,' but over time it evolved into its current meaning of 'to enroll in the armed services or seek help.'