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1. Challenge the honesty or veracity of
   "the lawyers tried to impeach the credibility of the witnesses"
    
2. Charge (a public official) with an offence or misdemeanour committed while in office
   "The President was impeached"
    
3. Bring an accusation against; level a charge against
   - accuse, incriminate, criminate

Derived forms: impeaching, impeaches, impeached

Type of: accuse, challenge, charge, file, lodge

Encyclopedia: Impeach