An Irish exclamation expressing surprise, agreement, or emphasis, similar to 'indeed' or 'well now.'
From Irish Gaelic 'ara' or 'arrah', an exclamatory particle with uncertain ultimate origin, possibly related to Old Irish expressions. It entered English through Irish English dialect in the 18th-19th centuries.
Arrah appears constantly in Irish-English literature and music, and it's one of the clearest markers that an author is trying to represent Irish speech—so overused by English writers trying to sound Irish that real Irish speakers sometimes avoid it to escape stereotyping.
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