1. witness (1) vt. 亲眼看到 Did you witness the accident? 你亲眼看到那场事故了吗? (2) vi. 作证; 证明 witness to sth. / doing sth. He witnessed to having seen the man enter the building. 他作证说他看到那个人进入大楼的。 (3) witness n. 目击者; 证人 She was called as a defense witness. 她被传唤作被告证人。