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Definition of Crazy Horse
1. Noun. A chief of the Sioux who resisted the invasion of the Black Hills and joined Sitting Bull in the defeat of General Custer at Little Bighorn (1849-1877). 
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1. Noun. A chief of the Sioux who resisted the invasion of the Black Hills and joined Sitting Bull in the defeat of General Custer at Little Bighorn (1849-1877).