Discredit
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
To destroy or impair the credibility of a person; to Impeach; to lessen the degree of credit to be accorded to a witness or document, as by impugning the veracity of the one or the genuineness of the other; to disparage or wcaken the reliance upon the testimony of a witness or upon documentary evidence, by any means whatever.