redeem
贖 centers on buying back or paying a price to restore something: to redeem, atone, or make amends.
贖 combines 貝 (shell, money) with 賣 (sell), suggesting a transaction where money is used to buy back or redeem something.
Shells (貝) were used as money, and 賣 means to sell. Together, 贖 shows using money to buy back something that was sold—redeeming it.
For ショク, imagine redeeming a pawned item with a shock of realization that you need it back: shock -> ショク, and you pay the price to get it back.
atonement
to atone for; to expiate; to redeem; to make up for; to compensate for
atonement; redemption; compensation
indulgence (in the Catholic Church)
indulgence (religious)
sacrificial goat; scapegoat
Yom Kippur; Day of Atonement
sacrificial lamb
sense of atonement