What is the meaning of impeach?

verb

• Challenge the honesty or veracity of.
  • usage: "the lawyers tried to impeach the credibility of the witnesses"
• Charge (a public official) with an offense or misdemeanor committed while in office.
  • usage: "The President was impeached"
• Bring an accusation against; level a charge against.
  • usage: "The neighbors accused the man of spousal abuse"
  • synonyms: accuse, incriminate, criminate