castle in the air

NOUN
17 LETTERS · STARTS WITH C

castle in the air is a valid 17-letter word worth 19 points in Scrabble and 21 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
C3A1S1T1L1E1I1N1T1H4E1A1I1R1
3 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 0 + 1 + 4 + 1 + 0 + 1 + 1 + 1 =19 PTS
DOUBLE WORD → 38TRIPLE WORD → 57
MEANING

What does castle in the air mean?

NOUN · 1 SENSE