In 2 Peter 2:13, this term labels false teachers as 'blemishes' (μῶμοι) who defile the fellowship meals of the church. Classical Greek uses the word for both physical flaws and moral reproach—a stain upon one's reputation or a disgrace to the community. The underlying idea is something that mars purity or integrity, whether in a sacrificial animal or in human character. Peter's rhetoric is harsh: these deceivers aren't just wrong, they actively contaminate the gathered assembly.