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Jyutping wu4 si1 lyun6 soeng2
Pinyin hú sī luàn xiǎng

Definitions (CC-CEDICT)
  1. to indulge in flights of fancy (idiom)
  2. to let one's imagination run wild
Definitions (粵典–words.hk)
  1. 語句
    亂​咁​諗​野
    with one's thoughts wandering
Definitions (Wiktionary)
  1. verb
    to daydream; to give way to foolish fancies; to go off into flights of fancy
    (syn.) 挐肆想
Definitions (HSK3.0)
  1. HSK3 七一九级词汇表 #1702
Examples (粵典–words.hk)
  1. Cantonese
    胡思乱想
    胡思亂想
    jyu4 si1 lyun6 soeng2
    • with one's thoughts wandering