unsin
verb/ʌnˈsɪn/
Etymology From un- + sin.
1
To undo or annul a past sin.
2
Obsolete To deprive (a sin, etc.) of sinfulness; to make sinless.
- when a ſin is paſt, grief may leſſen it , but not unſin it.1623, Owen Feltham, Resolves: Divine, Moral, Political: