In August, the gate of wild geese opens, and the geese’s feet come with frost. In August, the wild geese begin to migrate south. Once the wild geese fly south, there will be frost.

It comes from "Song of Common Sayings": Throw away your fans at the beginning of autumn, dress randomly in February and August, summer rains are less and autumn frosts are early, in August the wild geese gate opens, and there is frost under the wild geese's feet.

Translation: After the beginning of autumn, the weather turns cooler, so there is no need for fans. The weather in February turns from cold to hot, and in August the weather changes from hot to cold, hot and cold, and the changes are erratic. Coupled with the differences in their physical constitutions, people naturally wear different clothes, which are thinner and thicker. There is little rain in summer, and autumn frost comes early. In the eighth month of the lunar calendar, wild geese begin to migrate south. When the wild geese fly over, frost is coming.

The formation of proverbs:

Spoken proverbs are one of the idioms, which refer to sentences that are conventional, widely popular, and have concise images. In a broad sense, colloquialisms include proverbs, idioms (quotations), idiomatic expressions and commonly used spoken idioms, but do not include dialect words, colloquial words, idioms in written language, or famous aphorisms in famous books; in a narrow sense, , Colloquial sayings are one of the genres with their own characteristics. They are different from proverbs and idioms, but some colloquial sayings are somewhere in between.

Spoken sayings come from a wide range of sources, not only from the oral creations of the people, but also related to famous poems, aphorisms, historical allusions, etc.

Reference for the above content: Baidu Encyclopedia - Common Sayings