Translation

• sb who is romantically involved with sb already in a committed relationship
• the other woman
• the other man
• third person
• third party (in dispute)
• disinterested party
• number three in a list

Synonyms

• 外人, 局外人, 异己, 旁观者, 生人, 路人, 闲人, 陌生人, 陌路