ge-birhtan
This might be just a supplemental entry adding to an entry in the Main Volume.
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
ge-birhtan
Take here ge-byrhtan and ge-brihtan in Dict. , and add : I. to make bright -Geberhtes clarificabit, Jn. L. 16, 14. II. to become bright, to shine Ic áhyrde míne sunnan, and heó gebyrhteð ; þonne forbærned heó ealle þíne æceras, Wlfst. 260, 8. [Goth. ga-bairhtjan.] Cf. Beorhtian.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.