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verb

bâtir des châteaux en Espagne

/ba.tiʁ de ʃa.to.z‿ɑ̃ ɛs.paɲ/

verb/ba.tiʁ de ʃa.to.z‿ɑ̃ ɛs.paɲ/

to chase rainbows, to build castles in the air (to make overly ambitious plans)

Synonyms: tirer des plans sur la comète

Literally, “to build castles in Spain”.