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roof  (roofs plural )
The plural can be pronounced [PH:r][PH:u][PH::][PH:f][PH:s] or [PH:r][PH:u][PH::][PH:v][PH:z].  
1  n-count The roof of a building is the covering on top of it that protects the people and things inside from the weather. 
...a small stone cottage with a red slate roof...  
2  n-count The roof of a car or other vehicle is the top part of it, which protects passengers or goods from the weather. 
The car rolled onto its roof, trapping him.  
3  n-count The roof of your mouth is the highest part of the inside of your mouth. 
the N of n 
She clicked her tongue against the roof of her mouth.  
4 If the level of something such as the price of a product or the rate of inflation goes through the roof, it suddenly increases very rapidly indeed. 
INFORMAL 
go through the roof  phrase V inflects 
Prices for Korean art have gone through the roof.  
5 If you hit the roof or go through the roof, you become very angry indeed, and usually show your anger by shouting at someone. 
INFORMAL 
hit the roof/go through the roof  phrase V inflects 
Sergeant Long will hit the roof when I tell him you've gone off.  
6 If a group of people inside a building raise the roof, they make a very loud noise, for example by singing or shouting. 
raise/lift the roof  phrase V inflects 
He raised the roof at the conference when he sang his own version of the socialist anthem, The Red Flag.  
7 If a number of things or people are under one roof or under the same roof, they are in the same building. 
under one roof/under the same roof  phrase PHR after v, v-link PHR 
The firms intend to open either together under one roof or alongside each other in shopping malls...