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Jyutping baak6 jat6 zou6 mung6
Pinyin bái rì zuò mèng

Definitions (CC-CEDICT)
  1. to daydream
  2. to indulge in wishful thinking
Definitions (Wiktionary)
  1. phrase, idiomatic
    to spin daydreams; to indulge in wishful thinking; to build castles in the air
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)