终身大事 life event
Explanation
指人一生中最重要的事件，通常指婚姻。
Refers to the most important event in a person's life, usually marriage.
Origin Story
话说唐朝时期，长安城内有一位秀才，名叫李元。他自幼勤奋好学，才华横溢，却一直未能找到心仪的女子。他年过三十，家中父母更是操碎了心，四处托人给他张罗婚事，希望他能早日找到终身大事，完成人生的一件大事。一日，他参加一位好友的宴会，席间结识了一位温柔贤惠的姑娘，名叫王婉。两人一见钟情，相谈甚欢，发现彼此在很多方面都有共同的兴趣爱好，彼此心心相印，从此开始了甜蜜的爱情之旅，最终走向了婚姻的殿堂，有情人终成眷属，最终完成了彼此的人生大事。
In the Tang Dynasty, there was a scholar in Chang'an named Li Yuan. He was diligent and talented, but had never found the right woman. When he was over thirty, his parents were very worried and sought everywhere for a suitable partner for him, hoping that he would soon find his life partner and complete an important matter in his life. One day, he attended a banquet of a friend, where he met a gentle and virtuous girl named Wang Wan. It was love at first sight, they chatted happily and discovered many common interests. They understood each other perfectly and began a sweet love story, which finally culminated in a wedding.
Usage
通常作主语、宾语，指婚姻大事。
Usually used as the subject or object, referring to marriage.
Examples
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他终于找到了自己的终身大事。
ta zhongyu zhaodaole zijide zhongshendashi.
He finally found his life partner.
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父母都盼着子女早日找到终身大事。
fumu dou panzhe zinu zaori zhaodao zhongshendashi
Parents hope that their children will find their life partner soon。