bifung
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.
bifung
AddWiþ hramman and wið bifunge, genime þás wyrte, Lch. i. 302, 8. Seó swuster eallum limum cwacode . . . hí þæt mihton tócnáwan on ðǽre swuster bifunge, Hml. Th. ii. 32, 21, 33. [O. H. Ger. bibunga.]
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.

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A Combined List of Abbreviations.