This is the seasonal wordage for this time of the year.  Apparently, it means worms go into the earth and hide themselves by sealing the hole they made, which can be paraphrased as worms begin to prepare for hibernation.

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今頃の七十二候の名称です。虫が土中に入り込んで、そのときに掘った穴をふさぐ・・・つまり虫たちが冬籠りの支度を始めるということらしいです。

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