ofer-gǽgan
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.
ofer-gǽgan
AddGif hwá þis ofergǽgð si quis transgressus fuerit, Chrd. 46, 15. Se cásere hét hine bewǽpnian and beforan his ansýne ætstandan . . . swilce ofergǽgendne his hláfordes bebod, Hml. S. 30, 411.
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.