Alternative form of light a fire under

(transitive, idiomatic) To have any desire, idea, or plan that is unlikely to be realized; to imagine visionary projects or schemes; to have an idle fancy or a pipe dream; to daydream.

sick building syndrome

(archaeology) pithouse

present participle of build castles in the air.

(archaic or poetic) simple past tense and past participle of build castles in the air.

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

(idiomatic, humorous) Something is gone and never coming back.

(idiomatic) A phrase used to announce the end of a show, usually one performed by an Elvis impersonator.

(chiefly imperative, colloquial) To cease worrying or complaining about something and move on.