Definition of roof verb from the Oxford Advanced American Dictionary

 

roof

 verb
verb
NAmE//ruf//
 
, NAmE//rʊf//
 
[often passive]Verb Forms present simple I / you / we / they roof
 
he / she / it roofs
 
past simple roofed
 
-ing form roofing
 
 
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to cover something with a roof; to put a roof on a building roof something (in/over) The shopping center is not roofed over. roof something with/in something Their cottage was roofed with green slate.
See the Oxford Advanced Learner's Dictionary entry: roof