1. to challenge, dispute, or argue against; to call into question
Usage: formal or literary; transitive verb

Examples

• The lawyer oppugned the witness's credibility during cross-examination.
• Several scholars have oppugned the authenticity of the manuscript.
• He oppugned the government's decision to raise taxes without public consultation.
• The critic oppugned the author's interpretation of historical events.
• They oppugned the validity of the contract on technical grounds.
• No one dared to oppugn the committee's final ruling.