I read it in a book but can't remember what topic now. Google just brings up a list of place names, but I'm sure it's not that. It's not in my Oxford dictionary either and I'm fairly sure it's not an abbreviation.
closed as off-topic by Mari-Lou A, user140086, NVZ, Nathaniel, Phil Sweet Jun 20 '16 at 17:02
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Might you be thinking of arras?
rich tapestry; tapestry weave; a wall hanging, as a tapestry or similar object; (Theater) a curtain suspended loosely across a stage and used as a backdrop or part of a stage setting. Origin: 1375–1425; late Middle English.
It is an interjection in Hiberno-English.
And the citation is from a book called "Testimony of an Irish Slave Girl" by Kate McCafferty:
The online Oxford English Dictionary has an entry for arrha, defined as:
Earnest-money, a part of the purchase-money given to ratify a contract; figuratively, a pledge.
The first citation is from 1574.
It is the way they pronounce 'arrow' in Norfolk. Perhaps it's from the writings of Norfolk humourist, Sidney Grapes!