Definition of Jim Crow noun from the Oxford Advanced Learner's Dictionary

 

Jim Crow

 noun
noun
BrE BrE//ˌdʒɪm ˈkrəʊ//
 
; NAmE NAmE//ˌdʒɪm ˈkroʊ//
 
[uncountable]
 
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the former practice in the US of using laws that allowed black people to be treated unfairly and kept separate from white people, for example in schools From the title of a song that was sung by white entertainers who tried to look and sound like African Americans.
See the Oxford Advanced American Dictionary entry: Jim Crow