‘私交’ literally combines ‘私’ (sī), meaning ‘private’ or ‘personal’, and ‘交’ (jiāo), meaning ‘to associate’ or ‘friendship’. Together, it refers to a personal, informal friendship between individuals—distinct from official, professional, or public relationships. It emphasizes emotional closeness, mutual trust, and voluntary connection outside formal roles or institutional contexts.

This term is commonly used when distinguishing private bonds from duty-bound interactions—for example, clarifying that two colleagues get along well personally despite having no official collaboration. It often appears in discussions about ethics (e.g., avoiding favoritism based on private friendship), diplomacy (distinguishing state relations from leaders’ personal rapport), or social commentary. While neutral in tone, ‘私交’ can carry subtle nuance: strong private friendships may be praised as genuine, but invoking them to justify bias is often criticized.