testify [testified, testifying, testifies](to make a declaration, or give evidence, under oath) verb [UK: ˈtest.ɪ.faɪ] [US: ˈtest.ə.ˌfaɪ]John testified. = John testimoniò.
witness [witnessed, witnessing, witnesses]((transitive) to furnish proof of) verb [UK: ˈwɪt.nəs] [US: ˈwɪt.nəs]We have witnesses. = Abbiamo dei testimoni.