Third-person singular simple present indicative form of build castles in the air

plural of castle nut

A nut with rounded extensions projecting past the nut's opening. A cotter pin is inserted through a hole in the bolt and bent around the castle nut's projections to lock the nut in place.

(idiomatic) A desire, idea, or plan that is unlikely to ever be realized; a visionary project or scheme; a daydream, an idle fancy, a near impossibility.

A large inflatable structure, resembling a castle etc., on which children jump and play as on a trampoline.

A small city, the county seat of Emery County, Utah, United States.

A small market town in Shropshire, England.

A village (named after the ancient castle) in Dorset, England (OS grid ref SY9681).

A small market town in Somerset, England.

A market town with a medieval castle in County Durham, England (OS grid ref NZ0516).