Definition of roof noun from the Oxford Advanced Learner's Dictionary

      

    roof

     noun
    noun
    BrE BrE//ruːf//
     
    ; NAmE NAmE//ruːf//
     
    (pl. roofs) Parts of a house, Mouth and teeth, Parts of a car
     
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  1. 1  the structure that covers or forms the top of a building or vehicle a flat/sloping roof a thatched/slate, etc. 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. see also sunroof See related entries: Parts of a house, Parts of a car
  2. 2-roofed (in adjectives) having the type of roof mentioned flat-roofed buildings
  3. 3the 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. 4roof of your mouth the top of the inside of your mouth See related entries: Mouth and teeth
  5. Word Origin Old English hrōf, of Germanic origin; related to Old Norse hróf ‘boat shed’, Dutch roef ‘deckhouse’. English alone has the general sense ‘covering of a house’; other Germanic languages use forms related to thatch.Extra examples Five people were killed when the roof fell in. I won’t have that man under my roof again! The burglars removed tiles to climb into the roof space. The hotel has a charming roof garden. The roof is supported by stone columns. The roof slopes down to the top of the windows. The roof was covered with red clay tiles. There are small windows in the roof. There’s a cat on the roof. We’re good friends but we could never live under the same roof.Idioms
    1. 1(of prices, etc.) to rise or increase very quickly House prices here have gone through the roof.
    2. 2(also hit the roof) (informal) to become very angry See related entries: Anger
    have a roof over your head
     
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    to have somewhere to live Thanks to Bob’s generosity, I still have a roof over my head.
    (informal) to suddenly become very angry See related entries: Anger to produce or make somebody produce a lot of noise in a building, for example by shouting or cheering Their cheers raised the roof.
    under one roof, under the same roof
     
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    in the same building or house There are various stores and restaurants all under one roof. I don't think I can live under the same roof as you any longer.
    in your home I don't want her under my roof again.
See the Oxford Advanced American Dictionary entry: roof