Adjective : an expiable crime.    From Dictionary.com. 

Missing silver spoons and cooked petty cash were trivialities usually expiable at the price of a boot-assisted dismissal; but this --!.    From Wordnik.com.  [The Yellow Claw] Reference

Camerino had come on first; in an access of jealous fury the Count had struck Camerino in the face; and this outrage, I know not how justly, was deemed expiable before the other.    From Wordnik.com.  [The Diary of a Man of Fifty] Reference

In 1794 the ruffians, Danton and Robespierre, fell in succession, and expiated their crimes (if indeed such crimes be expiable at all) on that guillotine which they had so often deluged with the blood of innocence, even of female innocence and beauty.    From Wordnik.com.  [Celebration in Baltimore of the Triumph of Liberty in France] Reference

"Had he only robbed the mail-coach, or broken into a gentleman's house, the offence might have been expiable; but to rob a clergyman, and a rector too!.    From Wordnik.com.  [Paul Clifford — Complete] Reference