testify /ˈtestifai/ vt. & vi. 1.作证，证明：［考句］ One witness testified that he’d seen the suspect run out of the bank after it had been robbed.一个目击者作证说他见到了那个嫌疑分子在银行被盗后逃离了现场。［考句］ He is the only person who can testify in this case, because the other witnesses were killed mysteriously.他是唯一在本案中作证的人，因为其他证人均被神秘的杀害了。2.表明，说明：Her tears testified her grief. 她的眼泪说明了她的悲伤。Her actions testify her willingness to help. 她的行动说明她乐于帮忙。