肥水不流外人田 [ㄈㄟˊ ㄕㄨㄟˇ ㄅㄨˋ ㄌㄧㄡˊ ㄨㄞˋ ㄖㄣˊ ㄊㄧㄢˊ; fei2 shui3 bu4 liu2 wai4 ren2 tian2] lit. don't let one's own fertile water flow into others' field fig. keep the goodies within the family (proverb) ◄ ►