Japanese Learning

What is the meaning of “秋の日は釣瓶落とし”?

Word	Reading	Meaning
秋の日は釣瓶落とし	あきのひはつるべおとし	the autumn sun sets as quickly as a bucket dropping into a well 秋の日が急に沈むことを、井戸に落とす釣瓶にたとえていう言葉。