For-feallan

According to the Old English Dictionary:

for-feallan

p. -feóll To destroy by falling, overwhelm:--Ðá cwóm micel snáw . . . Ðá ic þá unmǽtnisse ðæs snáwes geseah, ðá þúhte mé ꝥ ic wiste ꝥ hé wolde þá wícstówe forfeallan cadere immense ceperunt niues, quarum aggregationem metuens ne castra cumularentur, Nar. 23, 16. for-feallan