Definition of roof noun from the Oxford Advanced American Dictionary

      

    roof

     noun
    noun
    NAmE//ruf//
     
    , NAmE//rʊf//
     
    (pl. roofs)
     
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  1. 1the 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
  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
  5. Idioms
      go through the roof
       
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    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
    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.
    like a cat on a hot tin roof
     
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    very nervous She was like a cat on a hot tin roof before her driving test.
    raise the roof
     
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    to produce or make someone 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 a number of stores and restaurants all under one roof. I don't think I can live under the same roof as you any longer.
    under your roof
     
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    in your home I don't want her under my roof again.
See the Oxford Advanced Learner's Dictionary entry: roof