What is said is settled; a promise is a promise, never to be revoked or broken.
这件事我们就这样定下来了，一言为定，谁都不能反悔。
We've settled this matter this way; it's a promise, and no one can go back on their word.
Era:
Ancient
Frequency:
Story:
Jia Lian, following the suggestions of You Erjie and You Sanjie, encountered Xue Pan and Liu Xianglian while on a business trip.
Jia Lian highly recommended You Sanjie to Liu Xianglian, and Xue Pan also advocated for strengthening family ties through marriage.
Liu Xianglian agreed to the marriage. Jia Lian said, '一言为定' (it's settled with one word), and proposed presenting a betrothal gift.
Liu Xianglian then entrusted Jia Lian with his ancestral treasured sword to take back.
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