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.
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Example sentences from the Web for whistle Dixie
“Clean as a whistle,” says a senior investigator involved in the case.
Hell, one of the Dixie Chicks even offered to Uber her balls over to the company.Sony: Hollywood’s Most Subversive Studio Under Attack|Marlow Stern|December 23, 2014|DAILY BEAST
My friend the political scientist Tom Schaller said all this back in 2008, in his book Whistling Past Dixie.
But Florida is kind of an outlier, because culturally, only the northern half of Florida is Dixie.
But admit it: at the first whistle, we all paid attention, to a part of the world that would usually prefer us all to butt out.
Robert uttered a shrill, piercing whistle which might have been heard back at the wharf.The Awakening and Selected Short Stories|Kate Chopin
Goodell paused in the doorway and emitted a whistle of surprise at sight of a horse in one of the stalls.Raw Gold|Bertrand W. Sinclair
Then he goes out, gits into his Pullman section, blows his punkin whistle and departs.Alec Lloyd, Cowpuncher|Eleanor Gates
He only tore himself from her reluctant arms as the final whistle sounded from the engine.The Pit Town Coronet, Volume I (of 3)|Charles James Wills
In a lull of the raging earth the distant whistle of the train could be distinctly heard.A Lost Hero|Elizabeth Stuart Phelps Ward and Herbert D. Ward