the mind > attention and judgement > contempt > disrepute > disgrace or dishonour > [noun] > infliction of disgrace > one who disgraces or exposes to disgrace (4)
One who exposes (in senses of the verb).
One who or something which shames.
One who or that which disgraces; one that exposes to shame or causes ignominy; †an opprobrious reviler (obsolete).