The allusion of disappearing for a day first came from the "Book of Songs", the earliest collection of poems in my country, specifically the article "The Book of Songs? Wang Feng? Picking Ge".
The original text is: He is picking geese. If you don’t see him for a day, it will be like March! The other person's picks are rustling, and not seeing him for a day is like three autumns! He is picking mugwort. If you don't see him for a day, he looks like he is three years old! The meaning of this passage is: That girl picking kudzu in the mountains. If I don't see her for a day, it seems like three months.
That girl picking mugwort on the mountain, a day without seeing her is like three autumns; that girl picking mugwort on the mountain, a day without seeing her is like a long time. It seems like three years have passed. Therefore, the phrase "one day's absence is like three autumns" has been used to describe the ardent longing for a friend.
The word "missing for a day" in this allusion describes the deep longing for a friend or a loved one. In "The Book of Songs", the author uses the term "a day's absence" to describe the length of time he has been separated from his loved ones, emphasizing the length of time and his loneliness. At the same time, through the metaphor of three autumns apart, it expresses the author's deep longing for his loved ones and his strong desire to meet again.
This allusion was widely used in later literary works to describe the feeling of missing a friend or a loved one. For example, in "Climbing the Stork Tower" by Wang Zhihuan, a poet from the Tang Dynasty, he used the white sun to cover the mountains and the Yellow River to flow into the sea. If you want to see a thousand miles away, you can go to a higher level to express your longing for your friends; in "Like a Dream" by Li Qingzhao, a poet from the Song Dynasty, she often remembers the sunset in the creek pavilion, intoxicated and not knowing the way back. Returning to the boat late after all the fun, I strayed into the depths of lotus flowers. Fighting for the crossing, fighting for the crossing, startling a group of gulls and herons to express their longing for their husbands.
Similar allusions to "Not seeing each other for a day":
Three autumns in one day and "Looking through the autumn water" are both used to describe the deep feeling of longing.
Three autumns in one day is an allusion from "The Book of Songs? Wang Feng? Picking Ge Ge". The original text is that one day without seeing is like three autumns. The meaning of this allusion is that a day without seeing the person you miss feels like three seasons. Later, "three autumns in one day" became an idiom, used to describe longing for each other and feeling that time is particularly long.
Looking through the Autumn Water comes from "The Romance of the West Chamber" by Wang Shifu, a dramatist of the Yuan Dynasty. The meaning of this allusion is that the eyes can see through it, describing the ardent hope for relatives and friends far away. Among them, "looking through" means eagerness of hope, and autumn water refers to the eyes. This allusion expresses the depth and urgency of longing, making people feel the pain of longing.
Although these two allusions are expressed in slightly different ways, they are both classic expressions used to describe the deep feeling of longing and the feeling of long time. At the same time, they also emphasize the pain of longing, making people feel the emotion of being unable to meet and longing to meet.