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Jyutping zyu2 suk6 dik1 aap3 zi2 fei1 liu5
Pinyin zhǔ shú de yā zi fēi le

Definitions (Wiktionary)
  1. phrase, idiomatic
    to lose what one has already got

煮熟的鴨子飛了 [---鸭-飞-]

Jyutping
Pinyin zhǔ shú de yā zi fēi le

Definitions (CC-CEDICT)
  1. the cooked duck flew away (proverb)
  2. (fig.) to let a sure thing slip through one's fingers