unsin

un- +‎ sin

• IPA^(key): /ʌnˈsɪn/

unsin (third-person singular simple present unsins, present participle unsinning, simple past and past participle unsinned)

1. (transitive) To undo or annul a past sin.
2. (obsolete, transitive) To deprive (a sin, etc.) of sinfulness; to make sinless.
   • 1623, Owen Feltham, Resolves: Divine, Moral, Political

     when a ſin is paſt, grief may leſſen it , but not unſin it.

unsin in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913

• Ninus, Sunni