Ge-stun

According to the Old English Dictionary:

ge-stun

Substitute: I. a deafening noise, crash :-- Þæt swínlice gestun porcinus (paganorum) strepitus, Wrt. Voc. ii. 85, 31. Gestunum fragoribus (fratoribus, MS.), 150, 41. II. a storm, tempest, hurricane :-- Þæt gestun and se storm and seó stronge lyft brecað bráde gesceaft hurricane and storm and tempest break up the wide world, Cri. 991. Dol swylteð, gif him Meotud þurh regn ufan of gestune lǽteð strǽle fleógan, Rä. 4, 56. Þurh gestun per turbinem, Wrt. Voc. ii. 68, 73. See next word. ge-stun