Available Definitions:
1) n. - The act of covering with a roof.
2) n. - The materials of which a roof is composed; materials for a roof.
3) n. - Hence, the roof itself; figuratively, shelter.
4) n. - The wedging, as of a horse or car, against the top of an underground passage.
5) v. t. - To inclose in a house; figuratively, to shelter.