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Jyutping soeng2 jap6 fei1 fei1
Pinyin xiǎng rù fēi fēi

Definitions (CC-CEDICT)
  1. to indulge in fantasy (idiom); to let one's imagination run wild
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic
    to indulge in fantastical thoughts; to daydream
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    千万别想入非非。
    千萬別想入非非。
    qiān wàn bié xiǎng rù fēi fēi 。
    • Be careful not to let your imagination run away with you.