What Does Tisha B'Av Mean. According to the talmud, other disastrous events such. Tisha b’av, the ninth day of the jewish month of av, is a fast day, commonly known as the saddest day in the jewish calendar.

How did tisha b’av start? Tisha b’av is a day of mourning and fasting that commemorates the destruction of the holy temple and other tragedies in jewish history.