corroborate Copy link Outline 1. affirmo, 1 (less freq. in this sense2. confirmo, 13. fidem alicui rei afferre (i. e. gain credence for a thing) • corroborate: 1. affirmo, 1 (less freq. in this sense: v. assert): to c. a person's words, dicta alicujus af., Liv. 2. confirmo, 1: to c. (statements) by arguments or testimony, argumentis, testimoniis c., Cic.: v. confirm. 3. fidem alicui rei afferre (i. e. gain credence for a thing): Cic.: v. credence. (N.B. Not corroboro or roboro; which signify to make strong.)