Literally "don't let one's own fertile water flow into others' fields"; this proverb means to keep benefits, wealth, or advantages within one's own circle or family rather than sharing them with outsiders.

(proverb) Literally meaning "do not let the nutrient-rich water flow into someone else's field," this is used to describe keeping all benefits or advantages for oneself or one's own group without sharing them with outsiders.

one should ensure that advantages or profits stay within one's own circle or family rather than letting others benefit

(variant form) the Battle of Feishui in 383 AD, where the Eastern Jin defeated the Former Qin forces