'ague' originates from Middle English, specifically the word 'ague,' which was derived from Old French 'ague,' meaning 'acute fever.'

'ague' changed from the Old French word 'ague' and eventually became the modern English word 'ague'.

Initially, it meant 'acute fever,' but over time it evolved into its current meaning of 'a fever or shivering fit, often associated with malaria.'