'aflutter' originates from Middle English, specifically the word 'flutteren,' where 'flutter' meant 'to move quickly or lightly.'

'flutteren' changed from the Middle English word 'flutteren' and eventually became the modern English word 'aflutter.'

Initially, it meant 'to move quickly or lightly,' but over time it evolved into its current meaning of 'in a state of nervous excitement or agitation.'