1. to give evidence as a witness in a court of law
Usage: legal
2. to make a statement based on personal knowledge or belief; to bear witness
3. to serve as evidence or proof of something

Examples

• The witness will testify in court tomorrow.
• She testified that she saw the accident happen.
• Several experts testified about the safety of the new drug.
• I can testify to his honesty and integrity.
• The broken windows testify to the storm’s intensity.
• His success testifies to years of hard work.
• The defendant chose not to testify in his own defense.