á-cwencan
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.
á-cwencan
Add:1. of flame (lit. or fig.) Ofþryhte, is ácweinte compressit (flammantis foci potestatem ), An. Ox. 4125. Ðá ðe líg grǽdignysse ácwenton (extinxerunt ), Scint. 112, 10. Fýr ácwencean, Ors. 4, 10; S. 200, 17, Ácwencan (-cwæncan, v. l. ), Wlfst. 157, 9. Ðá fýr wǽron ádwǽscte and ácwencte, Nar. 23, 20. Brynas ácwencte faculas restinctas, An. Ox. 4391. 2. of other things Gesihða yfele ácwencð (extinguit ) hungor, Scint. 56, 14. Se crístendóm ne mihte beón þanonforð ácwænced nǽfre, Ll. Th. ii. 372, 20.
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.