1. to challenge, dispute, or argue against; to oppose or attack with words
Usage: formal or literary; present participle of 'oppugn'

Examples

• The lawyer spent hours oppugning the witness's credibility.
• Critics were oppugning the new policy before it was even implemented.
• She found herself oppugning claims that she had once believed.
• The committee began oppugning the proposal on multiple grounds.
• Rather than oppugning his motives, we should focus on the facts.
• He was oppugning every statement made by the opposing side.