- roof ► NOUN (pl. roofs) 1) the structure forming the upper covering of a building or vehicle. 2) the top inner surface of a covered area or space. 3) the upper limit or level of prices or wages.► VERB (usu. be roofed) ▪ cover with or as a roof.● go through the roof — Cf. ↑go through the roof● hit (or go through) the roof — Cf. ↑go through the roofDERIVATIVES roofless adjective.ORIGIN Old English.
English terms dictionary. 2015.