For-týnan

According to the Old English Dictionary:

for-týnan

p. de; pp. ed To shut in, stop, hinder; interclūdĕre :-- Hí mid gelomlícum oncunningum tiledon ðæt hí him ðone heofonlícan weg fórsetton and fortýndon qui crebris accūsātiōnĭbus ĭter illi cœleste interclūdĕre contendēbant, Bd. 3, 19; S. 548, 4. for-tynan