In a roaring state; characterized by or making loud roaring sounds; in a state of tumultuous activity.
From 'a-' (prefix meaning 'in a state of') plus 'roar' (from Old English 'rārian'). This archaic formation follows Middle English patterns of prefixing 'a-' to create adverbial descriptions of ongoing action or state.
The 'a-' prefix is almost dead in modern English (we don't say 'afire' or 'asleep' much anymore), but when people use archaic words like 'aroar,' it creates an intentionally theatrical, Shakespearean tone!
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