Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: hrof

roof

1 noun
     
roof
Related topics: Building, Construction
roof1 S3 W2 [countable]
1TB the structure that covers or forms the top of a building, vehicle, tent etc:
They finally found the cat up on the roof.
roof of
We can probably strap the cases to the roof of her car.
a flat roof
a pitched roof (=sloping roof)
red-roofed/metal-roofed etc
a wooden-roofed theatre
2TBC the top of a passage under the ground:
Suddenly, the whole tunnel roof caved in.
3

a roof over your head

DHH somewhere to live:
I may not have a job, but at least I've got a roof over my head.
4

go through the roof

informal
a) also hit the roof to suddenly become very angry:
Put that back before Dad sees you and hits the roof!
b) if a price, cost etc goes through the roof, it increases to a very high level
5

the roof of somebody's mouth

HBH the hard upper part of the inside of your mouth
6

under the same roof/under one roof

in the same building or home:
If we're going to live under the same roof, we need to get along.
Here you can buy food, clothes, and electrical goods all under one roof.
7

under somebody's roof

spoken in your home:
As long as you live under my roof, you'll do as I say.
8

the roof falls/caves in

informal especially American English if the roof falls in or caves in, something bad suddenly happens to you when you do not expect it

➔ raise the roof

at raise1 (23), sunroof

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