1. past tense of oppugn; to challenge, dispute, or argue against something
Usage: formal or literary; transitive verb

Examples

• The lawyer oppugned the witness's credibility during cross-examination.
• Several scholars oppugned the authenticity of the newly discovered manuscript.
• He oppugned the committee's decision in a formal letter to the board.
• The opposition oppugned every clause of the proposed legislation.
• Critics oppugned the theory as lacking sufficient empirical evidence.
• She oppugned his interpretation of the historical documents.