impugn a witness

impugn a witness verb assail, attack, call in question, cast doubt, cast doubt on testimony of a witness, cast doubt on the integrity of a witness, challenge, confute, contest, contradict, controvert, criticize, denounce, discredit, dispute, find fault with, impeach, involve in suspicion, oppose as false, question a witness, raise questions regarddng the integrity of a witness, rebut, refute, reveal, underrine confidence in a witness, undermine the credibility of
Associated concepts: impeachment, impugn a witness's competency or credibility, rules of evidence