For-tíhan

According to the Old English Dictionary:

he -tíþ;

for-tíhan

p. -táh, pl. -tigon; pp. -tigen To draw against or over, cover over with anything, darken, obscure; obdūcĕre :-- Mid gedwol-miste fortíþ mód covers over the mind with the mist of error, Bt. Met. Fox 22, 67; Met. 22, 34. DER. tíhan I. [Germ. vorziehen.] for-tihan