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