of-gán
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.
of-gán
II. AddNú mé is mín ágen ætwiten swilce ic hit hæbbe forstolen, and man mid wítum ofgán willað æt mé ic mid rihtan þingon begyten hæfde, Hml. S. 23, 600. III. AddÁbæd Ósgár abbud æt Ælfhere ealdormenn hé móste ofgán land æt him mid sceatte. Ðá tíþode se ealdorman him, and se abbod sealde him ðá án hund mancosa goldes, C. D. B. iii. 547, 6. [v. N. E. D. of-go.]
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.