Ge-dwínan

According to the Old English Dictionary:

ge-dwínan

p. -dwán, pl. -dwinon; pp. -dwinen To dwindle or vanish away, disappear; evanescere, disparere :-- Ðæt hálige sǽd gedwán and gewát the holy seed has wasted away and departed, Blickl. Homl. 55, 29. His drýcræftas gedwinon his magic vanished, Shrn. 135, 1. ge-dwinan