Archaic KJV Word
Sabbath
Modern equivalent: day off
What Was Lost
The delight in completion. God did not rest because He was tired. Shabbat was the celebration of finished, good, complete creation. Entering sabbath was entering God's own delight -- 'this is finished, this is good, now enjoy it.' The Sabbath was not a restriction but a weekly invitation to stop striving and celebrate with God.
Closest Survivor in Modern English
Sabbath (still used but burdened by 'what you can't do' rather than liberated by 'what God completed')
Peak Usage (1611)
KJV Genesis 2:3 -- 'God blessed the seventh day, and sanctified it'; Exodus 20:8 -- 'Remember the sabbath day, to keep it holy'
Died still used but rule-ified (~1800)
Hebrew shabbat ('to cease/stop/rest/delight in completion') was rule-ified into a list of prohibited activities. The celebration of God's finished creation became a burden of restrictions.
What Replaced It
“day off”
Leisure time; shabbat was participation in God's own rest after creation -- entering the rhythm of divine completion
“rest day”
Physical recovery; shabbat was theological -- a weekly declaration that God finished His work and it was good
“Sunday rules”
Restrictions; shabbat was designed as delight, celebration, and liberation from the tyranny of productivity