Knowing the arrival of autumn by one leaf is a Chinese idiom, which means that you can know the arrival of autumn from the falling of a leaf. It is a metaphor that through individual subtle signs, the development trend and results of the entire situation can be seen.
Pinyin: zhī qiū yī yè
Source: "Huainanzi · Shuo Shan Xun": "You can know that the year is approaching when a leaf falls." "Wen by Tang Geng of the Song Dynasty" "Lu" quotes a poem from the Tang Dynasty: "The mountain monk does not know how to count Jiazi, and one fallen leaf knows the autumn of the world."
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Synonyms: Knowing the writing by seeing the subtle details, knowing the autumn by falling leaves
Synonyms: knowing the autumn by one leaf
Grammar: contraction; used as an attributive; refers to inferring the future from a part