borh
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.
borh
Add: I a. what is given as security Fó tó þam borge sé þe þæs weddes waldend sý, Ll. Th. i. 254, 21. II. add: of a body of persons Hér swutelað seó gewitnes and se borh þe þǽr æt wǽron (here follows a list of names ), C. D. iv. 235, 19. v. god-borh.
This is a supplementary entry with editorial changes to an entry in the main volume of the dictionary. Look under the 'Possibly connected entries' below, or for the same headword in the list to the left.

A Combined List of Abbreviations.

Abbreviation not recognized. See:

A Combined List of Abbreviations.