/ˈtɛstɪˌfaɪ/ – verb
Definition: 1. khai, chứng nhận, làm chứng, xác nhận;
2. là bằng chứng, là chứng cứ;
3. tuyên bố, khẳng định, quả quyết.
A more thorough explanation: In legal terms, “testify” means to give evidence as a witness in a court of law, typically by making a formal statement under oath or affirmation.
Example: The witness will be required to testify under oath in court.