'aroint' originates from Early Modern English, specifically the form 'aroint' recorded in 16th–17th century usage, where the prefix 'a-' functioned as a directional or intensive element (roughly 'away') and the remainder of the form is of uncertain origin.

'aroint' changed from dialect and Early Modern English forms such as recorded imperative uses (for example in drama and pamphlets) and was used as an order meaning 'be gone'; it appears in literature of the 16th–17th century and later fell out of regular use into archaic status.

Initially it meant roughly 'be away' or 'go away' (an imperative or forceful dismissal); over time it remained essentially an interjection/verb meaning 'begone' but became archaic and rare in modern English.