a person who is expected to accomplish much in a given field: the white hope of the American theater.
Sports. (formerly) a white man who had a good chance of winning the heavyweight boxing championship from a black man.
Origin of white hope
First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
informal a person who is expected to bring honour or glory to his group, team, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
c.1912, originally in sporting use in reference to the quest for a white man capable of beating champion pugilist Jack Johnson.
Online Etymology Dictionary, © 2010 Douglas Harper