"Wěn bié" literally combines 吻 (wěn), meaning 'to kiss', and 别 (bié), a classical or literary word for 'farewell' or 'parting'. Together, they form a poetic, emotionally charged noun meaning 'a farewell kiss' — a kiss exchanged when saying goodbye, often implying deep affection, tenderness, or finality. Unlike the more neutral 'kiss goodbye', 吻别 carries a subtle literary or cinematic tone, frequently appearing in novels, songs, films, and heartfelt conversations.

This term emphasizes emotional weight over physical action: it’s not just any kiss, but one imbued with parting sentiment — whether bittersweet, romantic, or solemn. It’s commonly used in written Chinese or formal speech rather than casual daily talk, and often evokes imagery of lovers at train stations, soldiers departing for war, or characters in poignant dramas. While grammatically a noun, it functions as a noun phrase and can serve as the subject, object, or complement in a sentence.