Why can't I go out?

There is a saying in the countryside that "seven don't go out, eight don't go home"

Don't go out on the seventh day of every month, that is, on the seventh, seventeenth and twenty-seventh days of this month. The "seven" here refers to the lunar calendar, because the lunar calendar is associated with the 24 solar terms, and each solar term is associated with crops in the field, so the date in most rural proverbs generally refers to the lunar calendar.

This is because the shape of the "seven" is not good, just like a dagger, so people always think it is not good to go out on this day. But the main reason of the ancients is that the meaning of the word "seven" is not good.