castle in the air◼◼◼(desire, idea, or plan unlikely to ever be realized) noun [UK: ˈkɑːs.l̩ ɪn ðə eə(r)] [US: ˈkæs.l̩ ɪn ðə ˈer]
bâtir des châteaux en Espagneverbe
build castles in the air◼◼◼(to have any desire, idea, or plan unlikely to be realized) verb [UK: bɪld ˈkɑːs.l̩z ɪn ðə eə(r)] [US: ˈbɪld ˈkæs.l̩z ɪn ðə ˈer]