一日三秋 A day feels like three seasons
Explanation
“一日三秋”这个成语表达了对远方亲人或爱人的深深思念之情。当人思念亲人或爱人时，时间仿佛过得格外漫长，即使只有一天的时间，也像是过了三个季度那样漫长，表达了思念的煎熬和痛苦。
The idiom “一日三秋” (Yi Ri San Qiu, a day feels like three seasons) expresses deep longing for a loved one far away. When people miss their loved ones, time seems to pass extra slowly. Even just a day can feel like three seasons, reflecting the agony and pain of missing someone.
Origin Story
传说古代有一个热恋的多情人，他与情人即使分离短暂的时间，都觉得是很长一段时间。他想象自己的恋人正在采葛、萧、艾，虽然离开才一天，他觉得上是三年，就像诗中描写的那样：“彼采萧兮。一日不见，如三秋兮！”
Legend has it that there was a passionate lover in ancient times who felt that even a short separation from his beloved was a long time. He imagined his beloved picking hemp, millet, and mugwort. Although he had only been away for a day, he felt that three years had passed, as described in the poem: “彼采萧兮。一日不见，如三秋兮！”
Usage
“一日三秋”常用于表达对亲人、爱人或朋友的思念之情，也可用在与朋友或家人久别重逢的场景中。
“一日三秋” (Yi Ri San Qiu) is often used to express longing for family, loved ones, or friends. It can also be used in scenes where you reunite with friends or family after a long time.
Examples
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分别的日子里，我时常想起你，一日不见，如隔三秋。
fēn bié de rì zi lǐ, wǒ shí cháng xiǎng qǐ nǐ, yī rì bú jiàn, rú gé sān qiū.
I miss you so much, every day feels like three seasons.
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相爱的人们，即使短暂的分离，也会让人感到一日三秋的思念。
xiāng ài de rén men, jí shǐ duǎn zàn de fēn lí, yě huì ràng rén gǎn dào yī rì sān qiū de sī niàn.
For lovers, even a short separation can feel like three seasons of longing.