impeach -
To bring a legal proceeding against a public official, asserting that because he or she committed some offense, he or she should be removed from office.
impeach -
To discredit an individual or group with presumed expertise.
impeach -
To demonstrate in court that a testimony under oath contradicts another testimony from the same person, usually one taken during deposition.
OmegaWiki Dictionary
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impeach To lay a charge against; bring an accusation against.