'undo' originates from Old English, specifically the word 'undōn', where the prefix 'un-' meant 'not, opposite of' and 'dōn' meant 'to do'.

'undo' changed from Old English word 'undōn' and through Middle English became the modern English word 'undo'.

Initially, it meant 'to unfasten or put out of condition', but over time it evolved into the broader current meanings of 'reverse an action', 'open/unfasten', or 'cause ruin'.