When someone greets you with "Shabbat Shalom," the appropriate response is to say "Shabbat Shalom" back. This is a Hebrew greeting that means "peaceful Sabbath" and is typically said on Friday evening as Shabbat, the Jewish day of rest, begins. While the literal translation of Shabbat Shalom is "Sabbath Peace," it is also used as a general greeting meaning "hello" or "goodbye".