Definition from Wiktionary, the free dictionary
From the Book of Rites
- Literally: To come then not go is not polite.
来而不往非礼也 (simplified, Pinyin 來而不往非禮也), traditional
- It is impolite not to reciprocate; Friendship cannot stand always on one side; It's impolite not to make a return for what one receives; One should return as good as one receives.