A-dwínan
Bosworth & Toller Anglo-Saxon Old English Dictionary - a-dwínan
According to the Old English Dictionary:
ic -dwíne, -dwínest, -dwínst, he -dwíneþ, -dwínþ,
- a-dwínan
- pl. -dwínaþ; p. -dwán, pl. -dwinon; pp. -dwinen To dwindle or vanish away; vanescere.