Fǽr-dryre

According to the Old English Dictionary:

es;

fǽr-dryre

m. A sudden or pernicious fall; repentīnus vel pernĭciōsus lapsus :-- Con he sídne ræced fæste gefégan wið fǽrdryrum he can firmly compact the spacious dwelling against sudden falls, Exon. 79 a; Th. 296, 9. fær-dryre