'aroint' originates from Middle English, specifically the word 'aroynt', where the prefix 'a-' functioned as an intensifier or 'away' and the stem is related to words meaning 'to drive off'.

'aroynt' appeared in Middle English and Early Modern English texts (often spelled 'aroint' or 'aroind'), used as an imperative; it survived in literary and dialectal usage into the 17th–19th centuries.

Initially it conveyed the sense 'drive off, rout' (a physical or emphatic pushing away), and over time it became chiefly an imperative interjection meaning 'begone' in literary and dialectal contexts.