Sab ‧ bath /ˈsæbəθ/ BrE AmE noun
[ Date: 900-1000 ; Language: Latin ; Origin: sabbatum , from Greek , from Hebrew shabbath 'rest' ]
1 . the Sabbath
a) Sunday, considered as a day of rest and prayer by most Christian churches
b) Saturday, considered as a day of rest and prayer in the Jewish religion and some Christian churches
2 . keep/break the Sabbath to obey or not obey the religious rules of the Sabbath