Testify | Mean of testify in English Dictionary

/ˈtɛstəˌfaɪ/

• Verb
• to talk and answer questions about something especially in a court of law while formally promising that what you are saying is true
1. She refused to testify about who had given her the information.
2. Three witnesses were called/summoned to testify at (the) trial.
3. She testified before Congress today.
4. He agreed to testify against his drug dealer.
5. They will testify for the defense/prosecution. [=they will testify because the defense/prosecution has asked them to]
6. He testified that he'd seen two people leave the building on the night of the murder.
• to talk about or say (something) in an honest and confident way
1. I can (personally) testify that the food at that diner is excellent.
2. Many of her former employees came forward to testify to her generosity. [=to say that she is a generous person]
• to show that something is true or real
1. These statistics testify to the fact that the program is working. [=show that the program is working]
2. The fact that doctors were able to catch the disease before it had spread testifies to the importance of medical screenings.
3. These statistics testify that the program is working.

• to talk to a group of people about your belief in God especially as part of a church service
1. Several people testified during the revival meeting.