Ofer-þrymm

According to the Old English Dictionary:

es;

ofer-þrymm

m. Exceeding power :--Ǽr ðon se wlonca dæg bodige þurh býrnan brynehátne lég egsan oferþrym ere that august day (doom's day) announce by the trumpet fire burning-hot, over-powering terror, Exon. Th. 448, 10 ; Dóm. 52. ofer-þrymm