Disculpate

v. t. [ imp. & p. p. Disculpated; p. pr. & vb. n. Disculpating. ] [ LL. disculpatus, p. p. of disculpare to disculpate; dis- + L. culpare to blame, culpa fault. ] To free from blame or the imputation of a fault; to exculpate. [ 1913 Webster ]

I almost fear you think I begged it, but I can disculpate myself. Walpole. [ 1913 Webster ]