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Jyutping fei4 seoi2 bat1 lau4 ngoi6 jan4 tin4
Pinyin féi shuǐ bù liú wài rén tián

Definitions (CC-CEDICT)
  1. lit. don't let one's own fertile water flow into others' field
  2. fig. keep the goodies within the family (proverb)
Definitions (Wiktionary)
  1. proverb
    Synonym of 肥水不落外人田 (féishuǐ bù luò wàirén tián, “a benefit should not be given to others and should be shared exclusively among one’s own people”).
    (syn.) 肥水不落外人田