whistle Dixie
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.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
How to use whistle Dixie in a sentence
At least on disaster funding, the Congressman can whistle Dixie.
GOP Meltdown: Paul Ryan Doubles Down On His Losing Southern Strategy | Lloyd Green | March 10, 2013 | THE DAILY BEAST
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