testify [testified, testifying, testifies](to make a declaration, or give evidence, under oath) verb [UK: ˈtest.ɪ.faɪ] [US: ˈtest.ə.ˌfaɪ]She testified against him. = Ella testificó contra él.
witness [witnessed, witnessing, witnesses]((transitive) to furnish proof of) verb [UK: ˈwɪt.nəs] [US: ˈwɪt.nəs]The witness did not seem nervous when he spoke at the trial. = El testigo no parecía estar nervioso cuando testificó en el juicio.