1. gave evidence or made a statement under oath in a court of law
Usage: past tense of testify
2. declared or affirmed something to be true based on personal knowledge or experience
Usage: past tense of testify

Examples

• The witness testified that she saw the defendant at the scene.
• He testified under oath about the events of that night.
• Several experts testified on behalf of the prosecution.
• She testified to the committee about the company’s practices.
• The victim testified against her attacker in court.
• Former employees testified about unsafe working conditions.
• The doctor testified that the injuries were consistent with the accident.