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Jyutping wun6 mat6 song3 zi3
Pinyin wàn wù sàng zhì

Definitions (Wiktionary)
  1. phrase, idiomatic
    to indulge in what one likes and lose one's sense of purpose; infatuation saps the will

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Jyutping wun6 mat6 song3 zi3
Pinyin wán wù sàng zhì

Definitions (CC-CEDICT)
  1. lit. trifling destroys the will (idiom); infatuation with fine details prevents one making progress
  2. excessive attention to trivia saps the will
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)