redeemer

transitive verb

1. to buy back
2. to get back; recover, as by paying a fee
3. to pay off (a mortgage or note)
4. ☆
   1. to convert (paper money) into gold or silver coin or bullion
   2. to convert (stocks, bonds, etc.) into cash
   3. to turn in (trading stamps or coupons) for a prize, premium, discount, etc.
5. 1. to set free by paying a ransom
   2. to deliver from sin and its penalties, as by a sacrifice made for the sinner
6. to fulfill (a promise or pledge)
7. 1. to make amends or atone for to redeem a blunder
   2. to restore (oneself) to favor by making amends
   3. to make worthwhile; justify

Etymology: LME redemen < MFr redimer < L redimere < re(d)-, back + emere, to get, buy < IE base *em-, to take > Lith imù, OSlav imǫ, to take