ge-nesan
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.
ge-nesan
Add:I. to escape from an evil in which one is involved. 1. absolute Þæt ealde wundor þǽra þreóra cnihta þe áworpene wǽron in þone byrnende ofen, and swá þeáh ungederede genǽson antiquum trium puerorum miraculum, qui projecti in ignibus laesi non sunt, Gr. D. 219, 19. 2. with acc. Þá men uneáðe þone ciele genǽson magnus hominum numerus frigoris acerbitate perierunt, Ors. 4, 8 ; S. 188, 2. Þú ðysne níð genesan móte, Lch. iii. 52, 17. II. to avoid an evil in which one might become involved Þ wé þurh þá ælmessan þá écan tintrega magon genesan, Ll. Th. ii. 394, 22. Cf. ge-nerian.
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.