To Expiate

1. (transitive or intransitive) To atone or make reparation for.
2. (transitive) To make amends or pay the penalty for.
3. (transitive, obsolete) To relieve or cleanseof guilt.
4. (transitive) To purify with sacred rites.
5. (transitive) To wind up, bring to an end.

Usage notes

Intransitive use, constructed with for (like atone), is obsolete in Christian usage, but fairly common in informal discussions of Islam.