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Engage in unrealistic, hopeful fantasizing, as in If you think you can drive there in two hours, you're whistling Dixie. This idiom alludes to the song "Dixie" and the vain hope that the Confederacy, known as Dixie, would win the Civil War.
whistle Dixieengage in unrealistic fantasies; waste your time. US
Dixie is an informal name for the Southern states of the USA. The marching song ‘Dixie’ ( 1859 ) was popular with Confederate soldiers in the American Civil War.
2001 New York Times These guys are just whistling Dixie…They're ignoring the basic issues that everyone's been pointing out to them for a decade.
To engage in unrealistically rosy fantasizing: "If you think mass transportation is going to replace the automobile I think you're whistling Dixie" (Henry Ford II).