be-dyrnan, wk.v: to hide, conceal. (beh-DUER-nahn / bɛ-ˈdyr-nan)
Lindisfarne Gospels; England (monastery of Lindisfarne), c. 700-3rd quarter of 10th century; British Library, Cotton MS Nero D IV, f. 18v. [iiif.bl.uk]
< OldEnglish be- prefix meaning on all sides or thoroughly +
Old Englishdiernan, dyrnan, dernan = Old Saxondernjan, Old High Germantarnan, tarnen, Middle High Germanternen to hide <Old Germanic*darnjan, < *darnjo-,
or from related adjective Old Englishderne, dierne, dyrne secret = Old Saxon derni, Old Frisiandern, hidden, secret, obscure, Old High Germantarni lying hid < Old Germanic*darnjo-.
Old English Wordhord 
< Old English be- prefix meaning on all sides or thoroughly +
Old English diernan, dyrnan, dernan = Old Saxon dernjan, Old High German tarnan, tarnen, Middle High German ternen to hide <Old Germanic *darnjan, < *darnjo-,
or from related adjective Old English derne, dierne, dyrne secret = Old Saxon derni, Old Frisian dern, hidden, secret, obscure, Old High German tarni lying hid < Old Germanic *darnjo-.
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