This verb carries the sense of speaking out against something in renunciation or denial. Classical usage included renouncing claims, disclaiming responsibility, or publicly disowning associations. Paul uses it in 2 Corinthians 4:2: 'we have renounced disgraceful, underhanded ways.' The context contrasts Paul's open, honest ministry with the deceptive practices of false teachers. The aorist tense suggests decisive action—a definitive break with shameful methods. This isn't passive avoidance but active repudiation.