roof

Universal Words noun, verb noun (plural roofs) 1 the structure that covers or forms the top of a building or vehicle: a flat / sloping roof * a thatched / slate roof * The corner of the classroom was damp where the roof had leaked. * Tim climbed on to the garage roof. * The roof of the car was not damaged in the accident. seealsoSUNROOF 2 (-roofed) (in adjectives) having the type of roof mentioned: flat-roofed buildings 3 the top of an underground space such as a tunnel or CAVE: The roof of the tunnel was starting to collapse. * The cave had a very low roof. 4 ~ of your mouth the top of the inside of your mouth IDIOMS go through the roof 1 (of prices, etc.) to rise or increase very quickly: House prices here have gone through the roof. 2 (also hit the roof) (informal) to become very angry have a roof over your head to have somewhere to live: Thanks to Bob's generosity, I still have a roof over my head. under one roof