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During the Spring and Autumn period, by the Qishui River in the State of Wei, there lived a young, innocent, and beautiful woman who had been abandoned by her husband.
A cunning man, seeing her, courted her with sweet words and proposed marriage. He made a solemn vow, pledging to stay with her until old age.
After autumn, they were married. However, the husband soon broke his earlier promise, seized her belongings, and heartlessly abandoned her.

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Open the tool →信誓旦旦 (xìn shì dàn dàn) is a Chinese idiom (chengyu) meaning “to make a solemn vow or pledge”.
信誓旦旦 is pronounced xìn shì dàn dàn in Mandarin Chinese.
Literally, 信誓旦旦 means “Sincere vows earnestly expressed”. It is used to mean “to make a solemn vow or pledge”.
信誓旦旦 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
信誓:表示诚意的誓言;旦旦:诚恳的样子。誓言说得真实可信。