This is the seasonal phrase for this time of the year.  “Black birds” here mean house swallows and the whole phrase means house swallows leave for the south in fall.  According to a folklore, swallows have always been a symbol for happiness.  The story goes if they come to your house and build a nest every year, they should bring happiness.  My mother’s natal home was just like that, which made my grandpa very happy.

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この時期の七十二候の名称です。燕が南国に向けて帰っていく時期だという意味だそうです。燕は昔から、毎年家に来て巣を作ると縁起がいいとされていたようで、母の実家でも毎年燕の一家が春に来て秋に帰っていくので、祖父が喜んでいました。

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