be whistling Dixie

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be whistling Dixie

slang To have an unrealistic, usually overly optimistic, view of something. "Dixie" was an anthem of the Confederacy, the losing side of the US Civil War. Primarily heard in US. You're whistling Dixie if you think we're making the playoffs this year.
See also: Dixie, whistle
References in periodicals archive ?
The going is also a known quantity at Southwell, and one who catches the eye is Whistling Dixie in the Lion Handicap (1.
Anyone who says 'Tomorrow morning I am going to change from a sterling base to another currency base' is whistling Dixie.