On-bén

According to the Old English Dictionary:

e;

on-bén

f. A prayer asking for something (evil) to come upon a person, an imprecation :-- Hí ús mid heora wiðerwordum onbénum and wyrinessum éhtaþ qui adversis nos imprecationibus persequuntur, Bd. 2, 2; S. 504, 4. on-ben