一去不复返 Gone forever
Explanation
形容过去的事情已经一去不回了，再也不会回来了。
Describes something past that is irretrievably lost and will never return.
Origin Story
公元前227年，燕太子丹派荆轲刺秦王，荆轲临行前慷慨悲歌：“风萧萧兮易水寒，壮士一去兮不复还！”歌声中，荆轲义无反顾地踏上了这条不归路，他的壮举虽然失败，但他视死如归的精神却永远铭刻在了历史的丰碑上。荆轲此去，如同江河奔流入海，一去不复返，他的决心和勇气，也成为后世无数仁人志士的学习榜样。这句诗词也因此成为千古绝唱，表达了壮士舍生取义、视死如归的豪迈情怀。
In 227 BC, Prince Dan of Yan sent Jing Ke to assassinate the King of Qin. Before his departure, Jing Ke sang a song of courage: "The wind howls, the water of Yi is cold, a brave man goes, never to return!" In the song, Jing Ke resolutely set out on his path of no return. Although his heroic undertaking failed, his spirit of sacrificing his life for righteousness forever remains inscribed on the historical monument. Jing Ke's departure, like a river flowing into the sea, never returns; his determination and courage have become role models for countless noble men and women throughout the ages. Therefore, this poem has become an eternal masterpiece, expressing the heroic sentiments of self-sacrifice and devotion to righteousness.
Usage
用来形容事情已经过去，不会再回来。
Used to describe something that has already passed and will not return.
Examples
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他决心要离开故土，一去不复返。
ta jueding yao likai gu tu yiqubufan.
He was determined to leave his homeland, never to return.
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时光一去不复返，我们要珍惜当下。
shiguang yiqubufan,women yao zhenxi dangxia
Time flies, let's treasure the present moment.