Swég-dyne
Bosworth & Toller Anglo-Saxon Old English Dictionary - swég-dyne
According to the Old English Dictionary:
-dynn, es;
- swég-dyne
- m. A resounding din, crash :-- Heard gebrec, hlúd, unrnǽte, swégdynna mǽst (the crack of doom.) Exon. Th. 59, 20; 955. sweg-dyne