O.E. þeccan "to cover," related to þæc "roof, thatching material," from P.Gmc. *thakan (cf. O.S. thekkian, O.N. þekja, O.Fris. thekka, M.Du. decken, O.H.G. decchen, Ger. "to cover"), from PIE *(s)tog-/*(s)teg- "cover" (see stegosaurus). The noun is O.E. þæc "roof, thatch," from the verb (cf. O.N. þak, O.Fris. thek, M.Du. dak "roof," O.H.G. dah, Ger. Dach "roof").