Definition of Jim Crow noun from the Oxford Advanced American Dictionary

 

Jim Crow

 noun
noun
NAmE//ˌdʒɪm ˈkroʊ//
 
[uncountable]
 
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the former practice in the U.S. of using laws that allowed black people to be treated unfairly and kept separate from white people, for example in schools From the name of a black character in a song that was sung on the cotton plantations.
See the Oxford Advanced Learner's Dictionary entry: Jim Crow