Definition of narrow verb from the Oxford Advanced American Dictionary

 

narrow

 verb
verb
NAmE//ˈnæroʊ//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they narrow
 
he / she / it narrows
 
past simple narrowed
 
-ing form narrowing
 
 
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to become or make something narrower This is where the river narrows. The gap between the two teams has narrowed to three points. Her eyes narrowed (= almost closed) menacingly. His eyes narrowed to slits. narrow something He narrowed his eyes at her. We're doing it to try to narrow the gap between rich and poor. Phrasal Verbsnarrow somethingdown (to something)
See the Oxford Advanced Learner's Dictionary entry: narrow