Past participle of betear (archaic); torn apart or damaged severely by tearing.
From the prefix 'be-' combined with 'torn' (past participle of tear). This follows the Old English pattern of intensifying meaning—betorn means thoroughly or severely torn, not just partially damaged.
In medieval texts, describing something as 'betorn' rather than just 'torn' made it sound absolutely destroyed—the 'be-' prefix was like adding emphasis with an exclamation point!
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