Examples from the Web for arr
I don't think you'd come ashore ag'in, on the arr'nd that brought you here afore.The Deerslayer|James Fenimore Cooper
So, ye'll tell me, little Belloni, is Arr'bella goin' to marry Mr. Annybody?Sandra Belloni, Complete|George Meredith
In the north of England "ar" or "arr" is still used for a mark.
And ealle uneawas he towyrp on his gecorenum mannum, and arr on him ealle godnysse.
Now thin, don't be gaping at the jury, sir; why arrn't you respectful and keep your eye on his lordship?The Confessions of a Caricaturist, Vol 2 (of 2)|Harry Furniss
"to growl like a dog," late 15c., imitative. In classical times, the letter R was called littera canina "the dog letter" (Persius).