Definition of great white hope noun from the Oxford Advanced Learner's Dictionary

 

great white hope

 noun
noun
BrE
 
; NAmE
 
(North American English)
 
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any white boxer who was thought to have a chance of beating Jack Johnson, who was the first African American heavyweight champion. The Great White Hope was a film (1970) based on Johnson's life. The expression is still sometimes used in the sport of boxing today, but usually in a humorous way.