Archaic KJV Word
Redeem
Modern equivalent: save
What Was Lost
The slave market. Redemption meant standing in an auction where humans were bought and sold, paying the price, and walking the slave out to freedom. The redeemer paid with his own resources. When this image fades, the cost of salvation becomes abstract rather than viscerally concrete.
Closest Survivor in Modern English
redeem (still used in theology but the marketplace image has vanished from common understanding)
Peak Usage (1611)
KJV Isaiah 44:22 -- 'I have redeemed thee'; Galatians 3:13 -- 'Christ hath redeemed us from the curse'
Died still used but diluted (~1970)
Detached from its marketplace origin. In the ancient world, redemption meant paying the price to buy a slave's freedom. Modern usage diluted it to vague 'saving' or even 'coupon redemption.'
What Replaced It
“save”
Generic rescue; redeem specifically meant paying a price to purchase freedom from bondage
“deliver”
Focuses on the result; redeem emphasized the cost -- someone paid to set you free
“rescue”
Emergency action; redemption was a legal, commercial transaction with a specific price