Definition of hollow verb from the Oxford Advanced American Dictionary

 

hollow

 verb
verb
NAmE//ˈhɑloʊ//
 
[usually passive]hollow somethingVerb Forms present simple I / you / we / they hollow
 
he / she / it hollows
 
past simple hollowed
 
-ing form hollowing
 
 
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to make a flat surface curve in The stairs have been hollowed by centuries of use. Phrasal Verbshollow somethingout
See the Oxford Advanced Learner's Dictionary entry: hollow