只为他倾城之笑只为她倾覆天下
[zhĭ wéi tā qīng chéng zhī xiào zhĭ wéi tā qīng fù tiān xià]
Translated, it means 'Smile for him alone to brighten up the whole city; turn over the entire world for her alone.' Both parts use metaphors for deep love and loyalty, indicating that one would do anything for their lover and express admiration for them. Such expressions emphasize undying devotion to specific individuals.