whistle dixie

Translations
строить воздушные замки
He is always whistling Dixie about starting his own business without a proper plan.
Он всегда строит воздушные замки о создании своего бизнеса без должного плана.
Definitions
To 'whistle Dixie' means to engage in unrealistic, fanciful, or overly optimistic talk or plans, often with the implication that such talk is pointless or disconnected from reality. The phrase originates from the song 'Dixie,' associated with the American South, and is often used in the negative, as in 'not just whistling Dixie,' to emphasize seriousness or sincerity.