Noun
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an upper limit on what is allowed
"he put a ceiling on the number of women who worked for him"
"there was a roof on salaries"
"they established a cap for prices"
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the inner top surface of a covered area or hollow space
"the roof of the cave was very high"
"I could see the roof of the bear's mouth"
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protective covering on top of a motor vehicle
-
a protective covering that covers or forms the top of a building
Verb
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provide a building with a roof
cover a building with a roof