castle in the air

Từ điển Oxford Learners Wordfinder Dictionary

noun

absentminded dreaming while awake
• Syn:
reverie, revery, daydream, daydreaming, oneirism,
air castle, castle in Spain
• Derivationally related forms:
daydream (for: daydreaming), daydream (for: daydream)
• Hypernyms:
dream, dreaming