To recover ownership of something by buying it back.
To liberate by payment of a ransom.
To set free by force.
To save, rescue
To clear, release from debt or blame
To expiate, atone (for)
To convert (some bond or security) into cash
To save from a state of sin (and from its consequences).
To repair, restore
To reform, change (for the better)
To restore the honour, worth, or reputation of oneself or something.
To reclaim
An act of redemption.