For-dwínan

According to the Old English Dictionary:

he -dwíneþ, -dwínþ;

for-dwínan

p. -dwán, pl. -dwinon; pp. -dwinen To dwindle away, vanish; evānescĕre :-- Fordwíneþ heó sona it soon will dwindle away, Herb. 2, 2; Lchdm. i. 80, 17. Mannes ege hrædlíce fordwínþ awe of man quickly vanishes, Homl. Th. i. 592, 12. Se sceocca fordwán of his gesihþe Satan vanished from his sight, ii. 504, 4. [Chauc. hondes for-dwíned: Dut. ver-dwijnen to vanish.] for-dwinan