Ge-hreósan

According to the Old English Dictionary:

ge-hreósan

p. -hreás, pl. -hruron; pp. -hroren To rush, fall, glide away, to fail; ruere, cadere, labi, deficere :-- Hrófas sind gehrorene the roofs are fallen, Exon. 124 a; Th. 476, 5; Ruin. 3. Ðá cómon hí to sumre ceastre gehrorenre venerunt ad civitatulam quandam desolatam, Bd. 4, 19; S. 588, 29. Ic ðus gehroren eom and aweg gewiten I [Babylon] am thus fallen and passed away, Ors. 2, 4; Bos. 44, 35. Móna niðer gehreóseþ the moon shall fall down, Exon. 21 b; Th. 58, 22; Cri. 939. Swíðe oft se micla anweald ðara yfelena gehríst swíðe fǽrlíce very often the great power of the wicked falls very suddenly, Bt. 38, 2; Fox 198, 8. Gehreósaþ labuntur, Exon. 95 a; Th. 354, 34; Reim. 55. DER. hreósan. ge-hreosan