Ge-hréfan

According to the Old English Dictionary:

ge-hréfan

p. de; pp. ed [hróf a roof] To roof, cover; tĕgĕre :-- Gehréf hit eall roof it all, Homl. Th. i. 20, 32. Holme gehréfed covered with water, Exon. 101 a; Th. 381, 12; Rä. 2, 10. ge-hrefan