A person who is not involved in or has no relation to a particular matter; originally referring to those watching a game of chess from the sidelines.

(idiom) not worth telling outsiders; a secret that should be kept between those involved; this phrase originates from the story of the Peach Blossom Spring by Tao Yuanming

personnel or public figures who are not members of the ruling political party

Someone who is not part of a specific group, social circle, or professional field

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.