cǽg-bora
This might be just a supplemental entry adding to an entry in the Main Volume.
Related §§ in Wright's OE Grammar:
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
cǽg-bora
Add: one who has charge of the keys of a jail, jailor Cǽgbora clavicularius. Wrt. Voc. i. 288, 45: ii. 17, 11. Sc̃s Heremus wæs cǽgbora in Róme, Shrn. 121, 23. [Cf. N. E. D. key-bearer.] Cf. cǽg-hirde.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.