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Impeach
1) To discredit, for example, to show that a witness is not believable -- perhaps because the witness made statements that are inconsistent with present testimony, or has a reputation for not being a truthful person. 2) The process of charging a public official, such as the U.S. president or a federal judge, with a crime or misconduct, which results in a trial by the senate to determine whether the official should be removed from office.
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