Shabbat - Sabbath (שבת). The verb form is shavat, meaning cease or stop. Interestingly, "to sit" is lashevet (לשבת) with the same shin-bet-tav root. It's first used in Genesis 2:2 where God "ceased" from his work. The noun form is Shabbat, often translated "Sabbath". It's also the name of the 7th day in the Jewish week – the other days are simply 1st Day, 2nd Day, etc...