/ ˈsæbəθ; NAmE / (often the Sabbath ) noun
[ sing. ] ( in Judaism and Christianity ) the holy day of the week that is used for resting and worshipping God. For Jews this day is Saturday and for Christians it is Sunday :
to keep / break the Sabbath (= to obey / not obey the religious rules for this day)
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WORD ORIGIN
Old English , from Latin sabbatum , via Greek from Hebrew šabbāṯ , from šāḇaṯ to rest.